I don't want Backstab removed I want it reworked into a more balanced function, and more engaging facing mechanics.
The more balanced mechanics is called flanking.
Not necessarily. Flanking as per the rules gives advantage which is generally considered too powerful and decreased to a +2 on attacks.
I also want the game to take facing into account (since tbt DnD doesn't have facing by default because it makes it unnecessarily complicated, but a video game with models have facing -- visually speaking -- by default) instead of just giving bonuses for being on the opposite sides of the target.
It could really be cool in such a TB video game but I really don't think it could work in BG3.
I guess it would require a massive rework of the entire combat system to be interresting more than boring. An easy facing implementation would just lead to the actual backstab and I don't think they're able to (they want to) go as deeper in term of tactical combats.