See discussion here:
[[Wikipedia:VisualEditor/Feedback]] and go to the section titled "VisualEditor not enabled for section editing". That talk section will end up in the archives eventually. Do an archive search then. 

Load time will still be an important factor with VisualEditor. That reason alone justifies continuing with section editing. 

If VisualEditor is enabled for section editing, then it will also be necessary to enable "edit source" somehow for sections too. So people can choose between the two. Just like at the top of page. If the developers are worried about cluttering up each section with both "edit" and "edit source" links, then there needs to be some icon next to "edit" that will be the link for "edit source". The clickable icon will have a popup tooltip saying "edit source".

I use section editing for almost all my editing, whether in short or long articles. Do you have section editing enabled? If not, you might try it. It speeds up editing immensely for me, and many others. See: 
[[Special:Preferences#mw-prefsection-editing]] and "Enable section editing via [edit] links". It would be better if it were enabled by default for all editors, whether logged in, or not. 

Many people will still use wikitext source editing. There will long be a need until every single bug is fixed in VisualEditor. I can tell you this from years of experience with the Wikia visual editor. Many, if not most, regular editors on Wikia avoid it due to its continuing bugginess. 

When using source editing I don't know why anybody would want to wade through paragraphs of irrelevant stuff to get to the paragraph and section one is interested in editing. Especially if you make multiple edits, and use multiple previews. Why wait long periods of time for full-page previews? A section preview is much faster. I have been editing Wikipedia since 2005, and at one point I had forgotten that section editing is not a given for all editors. We are wasting a lot of editors time by not enabling it by default. Since there are fewer and fewer editors we need to make their editing more and more efficient.

Anonymous editors do much of the editing on Wikipedia, and many will prefer to edit the source wikitext for all the reasons previously discussed. Many anonymous editors are experienced Wikipedia editors, and will not tolerate having to only use VisualEditor. So never get rid of the option for source editing. Let me repeat: WIKIA, WIKIA, WIKIA. Bugs are seemingly never-ending and ever-growing with visual editors.