Flexibility in an OS to handle a variety of hardware is not a problem at all. In fact, it's a very good thing. Google is letting manufacturers with experience d

Flexibility in an OS to handle a variety of hardware is not a problem at all. In fact, it's a very good thing. Google is letting manufacturers with experience decide the best way to add buttons - or not add buttons - to their devices. Android devices without physical buttons will likely have software equivalents. To most customers, there isn't much difference between a hard and a soft button.