Firstly, that is not overpowering unless you learn to play all classes. Two, as an archer, aiming from a horse, even with my previous warband experience, is tough here (though it gives me mobility). While being able to pick up other classes' stuff is nifty, you still need to learn it. And it is not easy.
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I made that post to emphasize on what a ban can entail on private servers. It was a bit out of context to be honest (since the bans were given for cheating and/or excessive/repeated trolling) and I was a bit out of the topic but then again I had no other example. The thing is, in my opinion, politics and games should not be in the same pot. Unfortunately, lately, they are.