Design Sojourn talks about the advantages and disadvantages of non-mechanical buttons.
““Static” buttons on the other hand have issues with feedback. Nothing moves, so there is no action and thus no reaction. Therefore designers that use “static” buttons need to employ a host of other feedback elements, like beeping sounds or lights. This is a very software driven interface and hence prone to software based problems. (Remember the blue screen of death?) If there is even a slight lag in response time, you would leave users wondering if they hit that button hard enough or if the angle of contact is even correct.”
Link: A petition to bring back buttons on phones? (designsojourn.com)
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