At the end of Act 1, are we stuck with the four companions we choose for the rest of the game like in Divinity Original Sin 2
Yes. According to their discord.
According to their FAQ too, but it is something I hate.
Same^^ Strange choice, never understood it.
Well thats incredibly disappointing.
In BG2 not only you had 15+ companions (not counting the incredible MOD companions; there are dozens. Something BG3 will probably never be able to achieve due to cinematic dialogue limitation. Even DOS2, doesn't have a SINGLE new MODDED-in companion.) , some of them came mid-game / end-game. And you can easily mix/match whoever whenever.