There are at least two separate requests here. They are related in that they both want to change the current behaviour of the two character sequence "[[" in VisualEditor but they want to change it in incompatible ways. 

Kipod is asking for the key sequence [[ to be treated the same as the key sequence ctrl+k. It is not asking for, nor would it require any changes to rendering. For the purposes of this comment I'll refer to this as "Kipod's request"

MZMcBride is commenting the original request which was for the sequence [[link]] to be parsed (either at save or on the fly) as if it were a link added using the link inspector. For the purposes of this comment I'll refer to this as the "original request".

The two are not the same and the past few posts have seen people talking past each other. 

I can see the merits of the original request but I can also see where the VE team are coming from. The desire stems from people wanting the best of both worlds - they want to be able to have the structure and layout of the visual editor with the low-level control they are used to in the source editor all in one place. Long term something like this really ought to be possible, but I don't think this is the way. Rather there should be some way for the visual editor to include non-visual blobs that it sends to the parser as is without doing anything to it (other than word wrapping in the editing window); and some way for the editor to mark the start and end of such blobs. This is not what the original request is asking for though.

Kipod's request is something that imho should not be included as a default, as while [[word]] or [[short phrase]] are unlikely to be anything other than links, [[ on it's own is far more ambiguous and there is more scope for the desired action to be something other than inputting a link. Rather there should either be a built-in method for users to define their own shortcuts or a simple way (an API?) for a gadget that allows users to reliably define their own shortcuts to have the same effect without needing to be rewritten every time VE or some other mediawiki component is updated. 

I recommend that if anyone wants further discussion on either request that the bugs are unmerged.