Backwards compatibility is good... But for how long?
When was the Playbar last sold? 2020?
If memory serves, it came out in 2013. None of my phones or computers from then are still working / compatible, either.
At least Sonos allows the PLAYBAR to continue to work, either on S1 or S2, but it can’t be bonded with the latest stuff. For some reason, I have trouble running those other computers on the latest OS as well.
The connection between the devices is TCP. The data they send is their own format. If they wanted it to work it would work.
Your old computers still access the internet, right?
Sure old computers don't have the hardware capacity for new OSs, but they can still 'talk' to one another with a TCP connection.
My PLAYBARs worked quite well under either S1 or S2, although I’ve since donated them to others, but they continue to work, as they always have, with Subs of their same time frame.
I have zero expectations that they would bond with ‘new’ hardware, changes are made to systems over time. The amazing thing to me is that Sonos continues to have them work and support them at all. Other companies, as I understand it, no longer support their own ‘older’ speakers. Your mileage, of course, may vary, I’m merely expressing my own opinion that tech moves forward.
I understand your frustration, but it doesn’t seem reasonable to me to expect hardware from 20 years ago to mesh with hardware from this year.
Get an older generation of Sub.
My Playbars still work great, fine devices.
That's what tech wants me to do. Return the sub 4 and get the older one.
Maybe, but I need to hate on Sonos for awhile. Then I will move on.
My wife says bag it and go all in on new system.
Life is short. (Happy wife is happy life)
That's what tech wants me to do. Return the sub 4 and get the older one.
Maybe, but I need to hate on Sonos for awhile. Then I will move on.
My wife says bag it and go all in on new system.
Life is short. (Happy wife is happy life)
Count your blessings…. some wives might object to spending the dollars to upgrade your system even for a $200 Sonos Ray 
Backwards compatibility is good... But for how long?
When was the Playbar last sold? 2020?
Yes it was 2020. Not that long ago in Sonos years.
But still s2 and compatible with the other subs and many surround speakers. Playbar still the sound king of Sonos soundbars, no need for the ultra imo 
I would agree for stereo and 5.1 sound, but I'm really liking well done Atmos sources.
