why do people dislike capacitive buttons?

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http://forums.androidcentral.com – I see some people posing that they dislike the capacitive buttons. I've seen the same comment about other phones as well. I don't understand what the reason(s) is/are. They're buttons- you push them, they do things. Does it have something to do with the on screen buttons disappearing to allow more screen to be used for whatever is being displayed? Posted via Android Central App (HowTos)