Well, to be fair RTS controls are not the end-all-be-all of videogame control schemes. It's fair to say that party movement can be improved, but I don't understand why would we ask Larian to overhaul the control scheme for the game.
In my opinion, the control scheme has never been the issue.
How well dangerous terrain, traps, etc. are communicated on screen, party members walking through fire when it wasn't clicked on, and the camera bouncing around were issues. Those issues would still be there with an RTS control scheme.