I was a bit worried about some of that missing functionality - just turned it back to RMB - and yeah, you're absolutely right. I thought stuff like alt-click not working was me just losing my mind. I wanted to learn the new stuff just because I don't want to end up bound to a bunch of input conventions that will end up depreciated - and I don't really care that much about LMB and RMB, or indeed any of the old blender UI, but I don't want to start using the tools on the left, since they are, as you say, useless. I'm more a 'select things, do an operation on them' kinda guy, so using a tool in edit mode (with a few exceptions) is kinda neither here nor there.

Well, I noticed a whole bunch last time I started it up. Granted, I haven't had much time to use blender recently, but:

- The orientation controls

- poke faces (Alt-p) doesn't exist

- the selection behaviour (A doesn't seem to deselect any more) - shift-G doesn't work

- W doesn't open a menu any more.

- Shift-tab doesn't change vertex/face/line selection mode any more.

Enough changed that I ended up clicking around the UI a lot. The orientation controls, and stuff starting with W were things I used to use a lot. I think when I get back into it, I'll spend a bit of time figuring it all out and learning the new conventions. I generally like the pie menu thing, and I like the move towards consistency (even if I think mnemonic keybindings are generally better), and Eevee is amazing for composing scenes (I used to hate trying to do lighting and having to wait for a half hour just to see the effect of moving a light a tiny bit).