I just turned on my office light within Snap, an open source environment to teach kid programming, literally minutes ago. I didn't even know that was possible 1h ago.

As others pointed out the point isn't to replace a switch, the point is to get efficient or creative or both with your home. Of course if your mind can handle a switch with a light bulb, no need to do more.

PS: no data left my home, no WiFi requirement, no third-party proprietary app. Sure most "Smart Home" setup are horrible in many ways, both privacy and security, but it's not because the most popular way sucks that all ways do.