"Keyboards are pianos with extra options."

That's the problem. Extra options tend to be destructuve of folk music, which thrives on making the most of our limitations.

Obviously "ban" in this kind of context should be a shorthand way of saying "I tend to be a bit apprehensive of this kind of thing". Attempts to impose actual bans are just be a signal for most of us to decide to go somewhere else. "Alcohol?" Good grief! That's the folk scene in the British Isles out the window for a start.