I do wonder what the reason behind Sonos not offering other Truyeplay device options is.
The reason given by Sonos is that the Sonos fanboys reviled Apple for being a closed system evil monolith is that being such, the variety of phone mic hardware that Sonos has to work with as part of the Trueplay process is much less compared to the free spirited world of Android phones. Being made by a PC like philosophy, there are many makers of Android phones, using mic hardware that is all over the place in terms of its variety, that is too much for Sonos to spend time and money on to accommodate all of them in Trueplay.
I don’t know enough of the facts behind this claim to call it out as false, but there is clearly some irony there.
And of course, Sonos behaving like Apple is a big reason why I moved to Echo devices for use as smart front ends to all five of my zones, that happened to have line in jacks on all the Sonos kit there that is now relegated to dumb roles in the music delivery chain.