joemike's response is more or less the scholarly, teacherly version of what I'd have posted, but I'll add to it that the only item mentioned in your linked article that I see as possibly not playing nice/a deal breaker is
If you want to use AirPlay to send content to your Mac from an iPhone, iPad, or another Mac, or to use your Mac as an AirPlay speaker, you’ll need a....
because it sounds like if you haven't got the right Mac it
may lead to a
loss of functionality, which would, indeed, be a deal breaker.
Otherwise, the lack of functionality may be disappointing, but it isn't a case of "not playing nicely," and unless you've found substantive documentation of problems in the underlying OS, i.e., Monterey, I can't see any reason for you to not upgrade. (Nor do I recall any FTM posters reporting any issues that might dissuade you.)
