Because following a long Larian tradition if there's a way to make abysmal party controls even worse is pairing them with basically omnipresent environmental hazards, of course.
That reminds me, I think part of the reason why people don't seem to care or realize how bad the controls are is because DOS2 had very little in the way of overworld puzzles, or you could cheese them all with the multitude of teleportation-style skills in that game. Overworld hazards don't really exist in BG3 yet outside of a select few situations, though I haven't played Grymforge yet and it sounds like it's as awful as expected there.
I remember it being absolute hell in DOS1, which had puzzles and environmental hazards out the ass, usually of the instant kill everything blows up variety for even a single party member stubbing their toe on something they shouldn't have. I remember constantly unchaining and rechaining towards the second half of the game especially. That game also had immediate game overs if your two main characters died, even if the other two party members were still up.
