The point of the damage cap?

To you possibly.
A hardcap is necessary otherwise those "OP" classes would be doing a higher output/minute. Yes, hits/second is unfair to you but this can be fixed by removing the potential system or reworking the game to make hitting the cap harder. Hitting the cap is inevitable so I don't understand why it's even retarded.

You're overlooking the fact that a damage cap doesn't even have to be a static, everyone-hits-this cap. It could vary for each skill, weapon speed, class, whatever.