I'm in the same boat. Due to numerous other Wi-Fi links around where I live, at best, I get reliable signal in one room, but that pretty much it. Because there are just so many devices yakking on Wi-Fi, even the 5Ghz band, where devices are supposedly to find the channel that is used the least, are saturated.
As for IoT devices, I do watch occasionally the Fiver channel on YT, which always has some new IoT item. Some are cool, others... why bother? If I were to spend the price premium for a "smart" fridge, I'd buy a refrigerator which runs on CNG or LP gas, as well as electric. Smart deadbolt? I'd like one that can tell me the status, and lock the deadbolt... but mechanically cannot unlock it from remote.
I've never understood why IoT devices don't move to a hub/spoke model. A hardened, central hub that does the Internet communicating, and the devices use Bluetooth and are paired with the hub (or hubs). This way, physical proximity is needed to the devices to had endpoints, and the hub can have IDS/IPS rules to handle compromised endpoint devices. This would go a long ways in solving the IoT security disaster.