Just a point of order:
Cousins was 5 for 6 in the Kentucky alumni game, and he was shooting some of them from 3 ft behind the line IIRC.
He has not shown he can hit them in any NBA game yet, however.
But if he could get OK with it (and he has a good shot), he's likely only going to shoot them when he's wide open.
A wide-open 3 pt shooter who shoots > 36 %?
Not impossible for him to get to, IMO.
Oh, and he's a lot less likely IMO to get offensive fouls called against him when he's shooting a 3.
This is of course theory-ball, because in practice Brick is right - it just messes up guy's heads and makes most people less impactful in their bread-and-butter game.