It partially comes down to what you buy. I've found that pre-flashed tasmota smartplugs are pretty bullet proof. They talk normal MQTT and wifi 2.4ghz. If you'

It partially comes down to what you buy. I've found that pre-flashed tasmota smartplugs are pretty bullet proof. They talk normal MQTT and wifi 2.4ghz. If you're buying some random smart crap with integration on some sketchy app then yeah you'll have a bad time That said, haven't scaled anywhere close to 100 devices