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I'd also give the PoE ESPs a look as well. As I mentioned, ESPHome is really useful for making devices yourself, e.g. you could easily add a bunch of wired sensors using both of those, whether that's door sensors/air quality/temperature/etc etc, there's a huge amount you can do. And the great thing about ESPHome is you know exactly what is running on the device.
Ahh ok. There's about a 50 device limit per hub on Hue. When you hit that, you could either move everything over to the HA server, or you can run multiple hubs, and then use diyHue to emulate a hub, and create a new virtual hub with both hubs merged. We have everything connected to the HA server through Zigbee2MQTT, but we still run diyHue as it works with HA as well. We use it because people like the app, and personally I like the app as well as it has some features that aren't easy or reasonable to add in Lovelace. We're also staying on version 3.8 of the app, before the new shitty redesign (I have a 3.8 apk I've modded to not update if you would like it).