My neighbors have two Hue bulbs that seem to be powered down most of the time but every few days they pop up and are added again to my network and my Zigbee network gets noticeably unreliable (probably because devices try to be routed over them). I can manually kick them with ZHA but I can’t prevent them from rejoining.
Settings → Devices & Services → Zigbee Home Automation → System Options
So I would need to always activate and deactivate again the auto joining when I need to repair dropped devices (which sadly happens a lot)?
Any options in “System Options” do not influence what/when devices join the network. They’ll only change if the entities in HA should be added automatically.
You shouldn’t have to constantly re-pair devices though.