I see your point this expensive and frustrating experience has caused me to raise several questions.
1) how open is Apple with the various printer manufacturers i.e. do they get notice of this and can they access the things they need to make the change?
2) Did Apple roughly actually know (or care) how many people this has adversely impacted? What percentage of those are now working from home? The impact it had on them?
3) where are the instructions to roll back to Catalina?(I’d far rather be able to use my existing printer and scanner than have icons with rounded edges.)
4)why was there no clear prior warning
that this would happen?
5)given the issues my Mac has caused me in the year I own it how loyal do I still feel to the company
But I know no one will ever answer these questions. Apple does not care and will just blame others. I do care but have no recourse to anything viable action other than buying a new printer and new scanner. My grandkids will be getting fewer Christmas presents.