+1 on UI mega thread, this thread mixes a lot of different topics and dilutes the value of each, which are all important IMO (GM4Him, I mean no offense, I agree 100% with all your suggestions but just fear that they will get buried as a side effects of the diversity of themes that you address, and of the suggestions section of the forum just mixing every theme together).
I'm surprised we don't have one mega thread per class TBH, pinned by mods (unless we do and I'm just dumb, which is also very possible). Or even bolder: one forum section per class. Although I can see the downside of added clutter of that last suggestion.

Back to the topic(s) addressed in this thread:
FWIW, I would speculate that the UI is still WIP. It's a little rough around the edges and I hope they won't release as is. Wouldn't be surprised if we see a redesign at some point.

Regarding Sneak attack, I've been playing with the Rogues Extra mod where they change the behavior of Sneak attack to be on auto all the time as a buff, and it's a game-changer. I can finally apply sneak attacks to weapon actions for example (or special arrow types).
Also, the bonus action for Dash just activates dash. No second click on your character necessary. You click on dash, no confirmation needed, it just applies. The game already does the same with hide, so I don't know why Dash should be any different, it's a bit annoying to have to second click when actions can only target the character that casts it.

Anyways, I have so much to say about the UI, and about Rogues, and about Fighters, but I guess I'd like dedicated sections for those themes.