Right but hopefully WiiM will get DLNA Cast sorted at which point you'll have the functionality that AirPlay has. I didn't actually miss anything other than perhaps if someone had previously stated the exact need for AirPlay was specifically multiroom, I missed that requirement.
I used AirPlay for 10 years, when it was actually lossless. It was never ideal in that it whacks the battery of the sending device because it's not a simple control point. Apple completely dropped the ball when "updating" that technology to AirPlay2, big step backwards when they could have actually improved it. Now it's just a piece of their walled garden increasingly used by only those subscribed to Apple Music and few others.
My representation of AirPlay2 stands as stated, everything I said about it was accurate, and I never said Bluetooth did multiroom. the fact remains that Apple does not play well with others (typing from a MacBook Air M2 so no not an Apple hater).