In other words you have never tried keybinding to any great degree if you can't even picture the snenario. I'm sorry to say but you cannot compaire two things if you have only ever tried only one of them. And no, don't even dare to turn this argument back against keybinders because most (if not all) of them have been a clicker at one point so they have experience from both sides to make a valid comparision.
This goes for many clickers to be perfectly blunt, they're talking about something they don't have a clue about. I was there once myself, I made the same arguments even though I was in no position to judge something I was inexrerienced with.
It's a tradition coming from older RPG's to please oldschool RP people. Some modern MMO's still have click to move but that doesn't mean it's on par with keybinding, or keyboard turning even.