Some of the "basic" stuff is actually surprisingly complex to do without compromising some other aspect IF we at Wire were to stick to always-E2EE-everything mantra. Case in point - delivery notifications. We're actually looking into them now.
Great. I understand that basic stuff could be complex, and I do prefer end-to-end encryption. I can't wait for these (and newer) features to be available so I can move out of Telegram. :)