upstatemike said:
So "no hub required" really means there is a hub but it is in the cloud so you don't have to configure one at home?
No. It literally means you don't need a hub to operate the device. Period. End. Full-stop.
You're attempting to view 'No hub required' through the lens of home automation. Don't. All the manufacturer is offering is a device that can be remote-controlled by a phone app (no really, check the packaging).
Got Wi-Fi? Excellent, now you can control your Lifx, HomeKit, etc gadgets using your phone. At most, the manufacturer claims you'll have a "smart home" but we here know it doesn't mean the same thing it used to. Nowadays, if you can remotely control it (remotely within the range of your Wi-Fi coverage or via someone's cloud service) well son, watcha got there is a 'smart' device. Ahem.
As for their use with home automation systems, that largely depends on whether the manufacturer was generous enough to provide an API, or someone took the time to reverse-engineer it, or (if based on an ESP8266) wipe out the device's firmware and replace it with Tasmota, ESPeasy or ESPurna and use MQTT to control it.
As for the devices that
require a hub, the hub is often a ZigBee controller (or proprietary RF protocol in the case of Lutron) and it doesn't profess to offer 'home automation' functionality. Basically, it's an Ethernet to ZigBee converter so, once again, your phone can control the bulb or switch.