Since VLAN isn’t officially part of the standard, you’d need all your network devices support it. And I wanted to give a device-load-balance. So not increase coverage but reduce the amount of devices per AP. Separate SSIDs and VLAN aren’t helping that it just makes it easier to track, wich group is causing the load
You’re right. I just gave a very simplified answer. VLAN isn’t part of the default network communication and therefore every „node“ needs to support it and be correctly set up, or otherwise the VLAN tag will be removed at that point.
And in my other comment I emphasized, that my main issue with multiple WAP is, to distribute the amount of devices each has to talk to. Multi SSID wouldn’t solve that