https://github.com/nfarina/homebridge-sonos
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Sonos 1 can be used as an Airplay 1 speaker with Homebridge so the ability to stream to it is there; seems more like Sonos just wants to push sales on new hardware?
Again, the older Sonos hardware doesn't have the RAM to support the airplay 2 buffer. ALC is vbr, but if you assume an average of 700kbps you need around 80MB just to store 2 minutes of buffered audio. The Play:1 only has a grand total of 64MB for the entire device.
Honestly the shocking thing from this announcement is that a 2015 device (Gen 2 Play:5) is being updated to support a software protocol announced in 2017.