Some silly stuff here. Wifi is not low latency, zigbee and other low rate networks are low latency esp across repeaters. Wifi rates are far, far higher. Slow zigbee response times are actually noticeable, fast local wifi appears instant to humans. Doesn’t matter much for IoT (pun not intended). I’m not a fan of setting up duplicate networks on the same band - was of money. I use zigbee for battery switches and sensors exclusively, lower cost wifi devices for everything else.

Wifi does not suffer dramatically from interference, esp neighbor interference - if it did, forget about zigbee with it’s weaker transmitters and forget router managed thread at 2.4GHz. Wifi is not a continuous carrier transmission protocol. It only transmits when it has data, and the closest transmitter will swamp out any transmitter further away. On the rare instances there is interference the protocol handles it easily and retransmits quickly, at wifi speeds there’s lots of dead space. Folks complaining about wifi interference are almost universally non-network people falling into a classic logical fallacy "I don’t know what it is so it must be ".

Wifi does suffer from crappy routers and APs that drop clients, udp, and multicast often used by wifi devices. Cloud devices suffer whether they’re wifi, or the hubs managed through the cloud (which they must be if you have remote access or google home integration.

Ok z-lots, let the unsubstantiated down votes fly!