As far as I know devices like Access Points only need the Controller to be configured or monitored. Once they are configured they work completely without it.
It doesn't really matter which part in the chain requires the stinking cloud as long as they sneak it in somewhere.
Speaking of which, I just bought a Razer mouse again because I've read they gave up on the login requirement for configuring your blinkenlights. But they didn't. They invented a 'guest login' instead.
Burned twice so far.
AFAICT, the controller is needed for fast roaming of clients.
So can I just ignore that option or do they make me register to the stinking cloud just in case?
IIRC the controller is needed to configure your AP anyway when you first set it up.
Indeed. You need the controller running first before you can configure AP, Switches, and gateways.