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The touch screen is there for other reasons (setup, navigation, ...) anyways and won't go away.

(Not) Having physical buttons then is a cost factor.

A switch requires a physical and tangible thing to be produced. A touchscreen button is done in software and costs nothing extra to produce. You already know this I'm sure.

>A touchscreen button is done in software and costs nothing extra to produce

Touchscreen had to be added, during the big move from buttons to touchscreen. It didn't just appear out of thin air.

Price is different from cost