Re: I agree with all of the posts so far (which is a first)
"in the time it takes"
And there's the rub. I've lived in this house for years; I can find my way around it blindfold and often move around in the dark. Notwithstanding that, I can put my hand on every lightswitch in the dark, should I need to see.
These are *interesting* technology, but they're in the same class as the smart thermostats: they're a solution for problem that doesn't exist. As others have mentioned, there is no function provided by this system that either isn't already available or would be better provided in the switch itself. In other words, Toys.