That’s because a smart bulb becomes dumb the instant you turn off the switch controlling it.
If most of your home’s lighting is in the ceiling and controlled by a switch on the wall, you might be better served by replacing those dumb switches with smart switches and dimmers, instead. That’s because a smart bulb becomes dumb the instant you turn off the switch controlling it. Leviton, Lutron, TP-Link, Ecobee, and other manufacturers make smart light switches that operate on your Wi-Fi network and don’t require a central hub.