I have no judgement for accessibility needs, but for the vast majority of consumers who need a shortcut for everything. There can be a good reason for someone to have a specific feature, but there is no reason for everyone to have every feature. Wheelchairs serve a purpose, but if everyone quit walking because wheelchairs were cheap, it would be a silly place.

on top of privacy, technical, and advertisement issues, I would bet that a house full of smart devices idly uses more power than leaving an led light on all night every once in a while.