Thanks for the link.
I just bought a PLAY:1 to use with Roon. Getting it up and running was just as easy as an Airplay device. Once the :1 was on the network, it showed up in Roon right away with no issues whatsoever.
It would seem then, that you set up your Sonos with the Sonos app, and then you don’t need the app/software at all anymore, it is completely managed by Roon directly.