Just an observation on my part - I don’t mind having to commit to the party (I tend to do it in RPGs), and if Larian does something more interesting with abandoned companions throughout the rest of the adventure, it could be a neat thing. I do agree that D:OS2 kill-off felt artificial and unnecessary.
It would be neat if NPCs would temporally join out party, as some critical NPCs do in Solasta.
Personally, I feel Larian still has work to do, to makes us take a fuller advantage of 4-man party, so to me whenever there will be 4 party limit or higher, isn’t much of a concern.