What about keeping **Version** and **Severity** in all cases, and the rest only when there is a value different than the default? Reasoning below.

>>! In T694#16895, @Aklapper wrote:
> 1) We have 4 dropdown fields with pre-defined values. By nature these fields must have one selected pre-defined value set: 
>  * Version

In fact Version is a hybrid: many products/components don't have a concept of version, and Bugzilla forces the related reports to have the only possible value: "unspecified" ([[ https://bugzilla.wikimedia.org/enter_bug.cgi?product=Analytics | example ]]). [[ https://bugzilla.wikimedia.org/report.cgi?x_axis_field=&y_axis_field=product&z_axis_field=&no_redirect=1&query_format=report-table&short_desc_type=allwordssubstr&short_desc=&product=Analytics&product=Commons+App&product=Cortado&product=Datasets&product=Huggle&product=Kate%27s+Tools&product=Logwood&product=Mathoid&product=MediaWiki&product=MediaWiki+extensions&product=MediaWiki+skins&product=MediaWiki-Vagrant&product=MobileFrontend&product=mwEmbed&product=OCG&product=OOjs&product=OOjs+UI&product=openZIM&product=Parsoid&product=Pywikibot&product=QRpedia&product=Spam&product=Tool+Labs+tools&product=Unofficial+Apps&product=Utilities&product=VisualEditor&product=Wiki+Loves+Monuments&product=WikiLoves+Monuments+Mobile&product=Wikimedia&product=Wikimedia+Labs&product=Wikimedia+Mobile&product=Wikipedia+App&product=Wiktionary+tools&resolution=---&resolution=FIXED&resolution=INVALID&resolution=WONTFIX&resolution=LATER&resolution=DUPLICATE&resolution=WORKSFORME&longdesc_type=allwordssubstr&longdesc=&bug_file_loc_type=allwordssubstr&bug_file_loc=&status_whiteboard_type=allwordssubstr&status_whiteboard=&keywords_type=allwords&keywords=&bug_id=&bug_id_type=anyexact&votes=&votes_type=greaterthaneq&version=.5&version=1.0.0+%28Android%29&version=1.0.3+%28Android%29&version=1.1.1+%28Android%29&version=1.3.x&version=1.4.x&version=1.5.x&version=1.6.x&version=1.7.x&version=1.8.x&version=1.9.x&version=1.10.x&version=1.11.x&version=1.12.x&version=1.13.x&version=1.14.x&version=1.15.x&version=1.16.x&version=1.17.x&version=1.18.x&version=1.19&version=1.19.0&version=1.19.1&version=1.19.2&version=1.19.3&version=1.19.4&version=1.19.5&version=1.19.6&version=1.19.7&version=1.19.8&version=1.19.9&version=1.19.10&version=1.19.11&version=1.19.12&version=1.19.13&version=1.19.14&version=1.19.15&version=1.19.16&version=1.19.17&version=1.19.18&version=1.19.19&version=1.19.20&version=1.20.x&version=1.21.x&version=1.22&version=1.22.0&version=1.22.1&version=1.22.2&version=1.22.3&version=1.22.4&version=1.22.5&version=1.22.6&version=1.22.7&version=1.22.8&version=1.22.9&version=1.22.10&version=1.22.11&version=1.22.12&version=1.23&version=1.23.0&version=1.23.1&version=1.23.2&version=1.23.3&version=1.23.4&version=1.23.5&version=1.23rc&version=1.24rc&version=1.25-git&version=2.0.21&version=2.1.19&version=2.1.21&version=2.1.22&version=2.1.23&version=3.0.0&version=3.0.1&version=3.0.2&version=3.0.3&version=3.0.4&version=3.0.5&version=3.0.6&version=3.1.0&version=3.1.0+%28iOS%29+%2F+1.1+%28Android%29&version=3.1.1&version=3.1.1+%28iOS%29&version=3.1.2&version=3.1.2+%28iOS%29&version=3.1.3&version=3.1.4&version=3.2.0&version=3.2+%28iOS%29+%2F+1.2+%28Android%29&version=Alpha&version=Android+%28alpha%29&version=Android+%28stable%29&version=Beta&version=Beta+%28Android%29&version=Beta+%28iOS%29&version=compat+%281.0%29&version=core+%282.0%29&version=iOS+%28alpha%29&version=iOS+%28stable%29&version=master&version=REL1_18+branch&version=REL1_19+branch&version=REL1_20+branch&version=REL1_21+branch&version=REL1_22+branch&version=REL1_23+branch&version=Stable&version=trunk&version=wmf-deployment&emailtype1=substring&email1=&emailtype2=substring&email2=&emailtype3=substring&email3=&chfieldvalue=&chfieldfrom=&chfieldto=Now&j_top=AND&f1=noop&o1=noop&v1=&format=table&action=wrap | 22572 reports (31%) have a version other than "unspecified" or "--" ]]. Well, ok.

>  * Platform/Hardware

[[ https://bugzilla.wikimedia.org/report.cgi?x_axis_field=&y_axis_field=product&z_axis_field=&no_redirect=1&query_format=report-table&short_desc_type=allwordssubstr&short_desc=&product=Analytics&product=Commons+App&product=Cortado&product=Datasets&product=Huggle&product=Kate%27s+Tools&product=Logwood&product=Mathoid&product=MediaWiki&product=MediaWiki+extensions&product=MediaWiki+skins&product=MediaWiki-Vagrant&product=MobileFrontend&product=mwEmbed&product=OCG&product=OOjs&product=OOjs+UI&product=openZIM&product=Parsoid&product=Pywikibot&product=QRpedia&product=Spam&product=Tool+Labs+tools&product=Unofficial+Apps&product=Utilities&product=VisualEditor&product=Wiki+Loves+Monuments&product=WikiLoves+Monuments+Mobile&product=Wikimedia&product=Wikimedia+Labs&product=Wikimedia+Mobile&product=Wikipedia+App&product=Wiktionary+tools&resolution=---&resolution=FIXED&resolution=INVALID&resolution=WONTFIX&resolution=LATER&resolution=DUPLICATE&resolution=WORKSFORME&longdesc_type=allwordssubstr&longdesc=&bug_file_loc_type=allwordssubstr&bug_file_loc=&status_whiteboard_type=allwordssubstr&status_whiteboard=&keywords_type=allwords&keywords=&bug_id=&bug_id_type=anyexact&votes=&votes_type=greaterthaneq&rep_platform=Macintosh&rep_platform=PC&rep_platform=Smartphone&rep_platform=Tablet+PC&rep_platform=Other&emailtype1=substring&email1=&emailtype2=substring&email2=&emailtype3=substring&email3=&chfieldvalue=&chfieldfrom=&chfieldto=Now&j_top=AND&f1=noop&o1=noop&v1=&format=table&action=wrap | 4789 reports (6.6%) have a value other than "All" ]]. In most cases the hardware is not even relevant, and sometimes reporters specify their hardware just because. I'm fine with migrating the values that were defined, but printing "Platform/Hardware: All" in 67.000 tasks is not very useful to the purpose of the task.

>  * OS

[[ https://bugzilla.wikimedia.org/report.cgi?x_axis_field=&y_axis_field=product&z_axis_field=&no_redirect=1&query_format=report-table&short_desc_type=allwordssubstr&short_desc=&product=Analytics&product=Commons+App&product=Cortado&product=Datasets&product=Huggle&product=Kate%27s+Tools&product=Logwood&product=Mathoid&product=MediaWiki&product=MediaWiki+extensions&product=MediaWiki+skins&product=MediaWiki-Vagrant&product=MobileFrontend&product=mwEmbed&product=OCG&product=OOjs&product=OOjs+UI&product=openZIM&product=Parsoid&product=Pywikibot&product=QRpedia&product=Spam&product=Tool+Labs+tools&product=Unofficial+Apps&product=Utilities&product=VisualEditor&product=Wiki+Loves+Monuments&product=WikiLoves+Monuments+Mobile&product=Wikimedia&product=Wikimedia+Labs&product=Wikimedia+Mobile&product=Wikipedia+App&product=Wiktionary+tools&resolution=---&resolution=FIXED&resolution=INVALID&resolution=WONTFIX&resolution=LATER&resolution=DUPLICATE&resolution=WORKSFORME&longdesc_type=allwordssubstr&longdesc=&bug_file_loc_type=allwordssubstr&bug_file_loc=&status_whiteboard_type=allwordssubstr&status_whiteboard=&keywords_type=allwords&keywords=&bug_id=&bug_id_type=anyexact&votes=&votes_type=greaterthaneq&op_sys=Windows+8.1&op_sys=Windows+8&op_sys=Windows+7&op_sys=Windows+Vista&op_sys=Windows+Server+2008&op_sys=Windows+Server+2003&op_sys=Windows+XP&op_sys=Windows+NT&op_sys=Windows+2000&op_sys=Windows+ME&op_sys=Windows+98&op_sys=Mac+OS+X+10.9&op_sys=Mac+OS+X+10.8&op_sys=Mac+OS+X+10.7&op_sys=Mac+OS+X+10.6&op_sys=Mac+OS+X+10.5&op_sys=Mac+OS+X+10.4&op_sys=Mac+OS+X+10.3&op_sys=Mac+OS+X+10.2&op_sys=Mac+OS+X+10.1&op_sys=Mac+OS+X+10.0&op_sys=Mac+System+9.x&op_sys=Linux&op_sys=FreeBSD&op_sys=NetBSD&op_sys=OpenBSD&op_sys=Solaris&op_sys=other&emailtype1=substring&email1=&emailtype2=substring&email2=&emailtype3=substring&email3=&chfieldvalue=&chfieldfrom=&chfieldto=Now&j_top=AND&f1=noop&o1=noop&v1=&format=table&action=wrap | 4930 reports (6.8%) have an OS other than the default "All"]]. Same reasoning as Platform/Hardware. 

>  * Severity

Nothing to say, I agree it should be always specified. It was a relevant field and we are getting rid of it.

> 2) We have 3 free-form text fields which can be entirely empty:

OK. Since I had the calculator at hand, and just to have an idea about the impact...

>  * URL

18% have something

>  * Whiteboard

3.1% have something

>  * See Also

7.6% have something