Best:

Network rack, unifi wifi, and cabling

Home assistant

Zigbee devices.

Smart heating/cooling

Automated lights

Hacked T6Es

Worst:

Batteried smart blinds (with not battery level reporting)

Bed mat sensors (some issues)

I wonder what his big ZigBee issue was that took him months to solve.

From the vague description it could be that his ZigBee stick was plugged directly into the USB port instead of using a USB extension cable, thus subjecting the ZigBee stick to all sorts of RF interference from the motherboard.

Or maybe the USB pass-through to the home assistant VM was wonky?

Edit: he talks about getting 30$ worth of hardware to fix the issue so it is probably not just a USB extension cable 🤔