The internet and cloud points are my favorite. Specifically the fact that those things are out of the picture.
No VLAN configuration necessary. The hub is "the VLAN". They literally can't phone home because they have no route to the internet, with no extra setup necessary. For WiFi devices, I have to make sure they're connecting to the right VLAN and controlled properly, and if I misconfigure something, they are phoning home or joining a botnet.
(This stops being as applicable if you have a sketchy hub you don't trust, but I trust deconz and ZHA fine enough in this context).
Its also free to play.
Or as some streamers say: its a $60 game with an incredibly generous free trial.