Being able to turn WIFI off per deco unit would be great.
Currently I am using one of my Deco units as a way to connect my NAS to the internet using ethernet since the NAS doesn't support WIFI.
I would love to be able to turn of wifi for this spcific unit because I already have another unit in the same room which is in a more optimal location for supplying WIFI.
By being able to turn off the wifi of a single unit I hope to be able to give some more space on the WIFI bands for the other devices and stop the constant switching of clients from unit to unit.

Turning the deco off using a smart plug wouldn't be viable because that will also cut the internet connection for the NAS ;). My NAS uses a M9 unit while my main unit in the same room is the newer XE75, so I would love to keep this on, because of the 6Ghz and other new features this deco comes with.