Fact is this is one of the few games where you use the left mouse button to move your character/s. In other games you use the right mouse button for that and with the left button you can easily select them by clicking or dragging. In my opinion this isn't a big issue to solve. At least i think it isn't.
well, as you point yourself, that's not exactly an insurmountable obstacle.
Party control in Baldur's Gate 3 is a complete mess that begs to be addressed. SAY NO TO THE TOILET CHAIN