In the old Baldurs Gate games, party members would even turn on each other depending on how far the party deviated from their baseline alignment.
This is still the case in BG3. Even though there is no alignment stated in the character sheet, the companions have their own ideals and things they wouldn't do. First, they will express their dislike and eventually leave the party when you have crossed the line.
Personally, I like that there is no alignment system in BG3. I must say I would not mind at all if the alignment system would be discontinued in pen & paper. I think with the traits, ideals, bonds and flaws in 5e character creation, you can describe a character in a more differentiated/complex way, but still define if your character is, for example, helpful or selfish.
