No mention of WiSA which already enables 11 speakers to work together in a 7.1, 5.1 surround sound system. Maybe WiSA gets an update as some signatories went their own wireless system like Dali, B&W with the Formation range. There are transmitters that work with WiSA and powerlink (B&O connections) that allow 16 WiSA speakers and 16 powerlink speakers to work together.
In WiSA the mix and match does work so rear speakers might be bookshelf speakers to the front floor standing then with sub-woofer and centre channel. Speakers from the same manufacturer often have a common sonic signature to them, maybe using the same test labs and team to tune them. There are more manufacturers using a stereo WiSA solution not making centre or sub-woofer even but allow the speaker to be select in any position.
Some WiSA transmitters seem to be limited to using their own WISA speakers for 7.1 not showing other WiSA speakers to select.