That post complains about not being able to view/manage images hosted by your instance, but v0.19.4 already fixed that last week? So that kinda disproves them saying the Lemmy developers didn't want it to be possible. Also the post complains about the amount of storage used by caching images but that was also fixed/improved in v0.19.4
Their other complaint about not being able to view a list of users, there's an open issue for that, give it a thumbs up reaction if you think it should be prioritized (github lets you sort by them like upvotes) https://github.com/LemmyNet/lemmy-ui/issues/2450
Also they probably want to avoid the issue of a user accidentally sliding it all the way to the left and then being unable to use their phone lol, there'd be no way to fix it except finding a dark room (if you were even aware of what happened and why your screen "won't turn on")