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I think it's the same for iOS, we were only using the Sonos app anyway. The 'on this phone' section just disappeared one day, which was hugely annoying as I used it to sit with draft bits of music I'm in the process of creating, on loop while I'm cooking or whatever. Really worked with my routine, so as much as its quite a specific personal requirement just one day finding it wasn't possible any more was next level infuriating.
We (my SO) still bought another one though, even though I argued that a business who's happy to just take away functionality isn't one I want to support. One day it'll only be possible to stream from a proprietary streaming service or something, but everyone will have spent £££ kitting out their whole house, so they'll just think 'in for a penny' and pay up.
Worse that that on Android. It's limited to streaming from the Sonos app, so you can only use sources which are supported by that. Means that - for example - you can listen to live BBC radio, but nothing from the BBC sounds app.
It's not a hardware limitation because the old Google Play Music app could cast to it, but since that's been killed there's no way to do likewise with Youtube Music. Dunno whether this is Google trying to drive their own hardware sales, or Sonos wanting everything to go through their app. Tech companies are cunts sometimes.
I've had serious buyers remorse with my One, which is frustrating because it a decent piece of hardware. Apart from the lack of a line-in port, which is a stupid omission.