A lot of the things you mention there have been in development for the better part of 10 years already, and still haven't reach a stable, mature and production-ready state yet. Unity have also kept deprecated stuff around for much longer than they should have, which sounds great on paper for backward compatibility, but it just means they're lugging years of technical debt with them and it's slowed them down immensely.

Looking at the past year of Unity updates, since 6.1 or so, it seems that most of the focus is now going to refactoring major parts of the engine to facilitate backporting HDRP's feature set to URP. It's all good work and high time they did some cleanup and committed to a single standardized render pipeline, but it's not exactly moving the needle forward very much yet.