1. I personally dislike the current UI and wish they would use a UI similar to DOS2. I hate having to physical click the Jump icon to jump instead of just having it on a hotbar. I also think that the HUD takes up a bit too much of the screen. I think the Journal could also be a little more easy to organize.
2. There is fog of war in the game, at least on the maps. Is that what you were referring to?
3. I disagree that there are way less environmental interaction/combos. I would honestly argue that there are about the same, and they probably plan on implementing more as they release more patches. They will more than likely implement a RTC with pause system later on though, like they did with DOS2 (at least... I think they did with DOS2?).