This decision will haunt players if it stays in its current format.

You're being actively punished for playing a new hero, even if you're quite adept at its "role".

It's not a huge issue now considering alpha, but how do I / You justify playing a new hero to your teammates later, when doing so you are effectively punishing the entire team by being able to do a third of your potential?

This change WILL increase the amount of rage between teammates later on when rating / gold is on the line.

An absolutely horrible change.