Yeah. Couple of points worth noting here:Yes, this is quite important, and is a big reason why 'WiFi extenders' often fail to provide any value (I just helped a neighbor deal with this). The 'extender' just rebroadcasts the same SSID, but is otherwise not integrated with the existing APs, so the APs and extended cannot assist the WiFi clients in making decisions about where to associate.
The same will happen with independent APs broadcasting the same SSID; they aren't aware of each other.
When a configuration with multiple integrated APs is used (for Ruckus that's Unleashed, SmartZone, etc.) then the 'controller' will help the APs configure themselves to minimize interference, maximize coverage, and assist clients as they roam around the coverage area.
- While AP-to-client signaling for 802.11k/v is standardized, the infrastructure underlying the APs' behavior is not, and every manufacturer seems to do that their own way. This is part of why you can't put together a random set of APs and expect to get k/v roaming support.
- A lot of manufacturers do seem to use the controller as an active part of k/v behavior. I'm currently using UniFi gear, and they don't: the controller tells the APs they are siblings and then the APs do the rest. This stems from what seems to be an ancient architectural decision on Ubiquiti's part that they would not require the controller functionality to be alive 24x7. They're in the minority on that AFAIK.