What is also in my mind: the app wasn't easy to fork and use on other (third-party) projects before that, too, however with the track in this direction (specific Parsons of contents, which apply to Wikimedia projects only) makes it, in reality, impossible to fork (and maintain) the app projects to other, MediaWiki based, third-party projects. I understand, that this might not be the goal of the WMF, which in my personal opinion isn't quite correct, however it's very very sad. I tried to maintain an up-to-date version of the Wikipedia app some time ago, but it takes so much time, as it is so Wikimedia, and not MediaWiki specific, that I ended up mostly stopping the effort in this direction.