The chain/unchain system is reserved for console platform, where it is better to control single character.

If Larian still wants to make it to console, they will never change it back to old crpg style.

Sadly but this is the truth. Just look at Dragon age, DOS2 was inspired by the party move style from DAO. And DAI is more a console game than a PC game with an awkward tactical system. Hope BG3 won’t follow the same pattern.