It can be a bit boring in combat since you basicly do the same thing every turn (get in position and then hit something with sneak attack). But since you control multiple characters, I don't think that'll be an issue in single player mode. If you are doing multiplayer (or at some point do actual DnD) and you are a rogue in a group with just full casters or people who multiclass, be prepared to spend most of the combat waiting for your next turn.
The extra Bonus Action BG3 Thieves get, along with the prevalence of available Bonus Actions in BG3, should make a rogue more interesting to play. Dip, shove, feint(?), drink a potion, and all the appropriate magic item-granted bonus actions. But even so, it will probably still be a bit...simple to play.
Having said that - the advantages stealth characters have makes sense to me in this context because if you can't sneak attack every round your dps is going to be terrible compared to other classes UNLESS they give you the ability to make different kinds of poisons that are progressively stronger, or sneak attack with the special arrows you find in game.
I mean, you don't
need stealth for sneak attack. It can greatly help, as it gives you Advantage = more likely to hit, but you can also just attack an enemy that an ally is next to.
Definitely agree that sneak attack should be applicable to using special (single-target) arrows.
