Guard the guy shooting the ball.The corner three being available, practically makes any emphasis on athleticism and driving, as mute as possible. Eliminating the corner 3 would do a lot to make the game more interesting again.
There, I have solved the 3 point problem vs anyone not named Stephen Curry. Only a handful of players in the league can shoot a contested 3 consistently.
The corner 3 is to punish you for doubling someone.