First, add night maps back to the game (I know you can, and it's not too hard if you look at the forums, please Ubi)
Second, try to rework maps will not help much for the game, you might need to release some new maps. (This is just my opinion.)
Third, this game should be "realistic" and operators should be from an organisation, why would you pull someone from space to rainbow six. Tho Iana is good, but should think more further.
Forth, for me, I think the old shader is more like RTX on, the one we're using currently is like RTX off.
If Ubi, you are looking this, thank you for looking at this, and I hope to see you respond our questions. But, if you didn't see any of our feedback, I don't know why you would create this feedback area. (This is because I've seen bunch of night maps suggest, I think you know these kind of suggestions had been around here since night map was removed.)
Sorry if I typed kind of rude, it's just tired of typing the same thing and not getting any results from updates.
Best luck for Tom Clancy's Rainbow six siege and Ubisoft.