I get it - Sonos bad. Maybe you could help educate me, I am not aware of Apple (who has been in business for many years longer than Sonos) of ever intentionally bricking devices (yes that oops moment with a bad software update on HomePod, but they replaced those and it was a mistake). Maybe you can send links to articles where this has happened, I'm not finding any.
Typically as an Apple product ages and does not have adequate hardware to keep up with new OS features, you can still keep using them on the old OS's, nothing lost, just lack of unsupported new features. Never heard of them bricking devices though
sonos didn‘t brick the speakers they are just not releasing any more firmware updates for four speakers that came out between 2006 and 2015 because of aged hardware. the speakers work fine by themselves, they just don‘t play nice with updated, newer devices. exactly the same same as with older apple products.
they usually work for quite some time (i think, you can still use an old ipod if you got the right adapters), but not always. good luck using airport utility with a 2nd gen airport express, for example.