Love it.
To add to what you said, for myself, i was in a 10 man guild. Moving Mythic to 20 man KILLED my guild. We had to recruit 10-12 new people who weren't on our page of progression.
My 10 man guild was SOOOOO fun because everyone knew each other personally and mistakes were funny, not a warning of being 'fired'. Meters were for shit-talking, not a resume.
Ever since the 20man mythic change over, i have limped along trying to raid, but it's just not the same. I really do not care to play with 19 other people. Mythic + feels bad too because of this, 9 people to choose from vs 19. Really don't want to help gear the new recruit who will probably leave after being geared anyways.
Throw Classic into the mix, and suddenly no one i want to play with logs in anymore.
Regret buying Shadowlands... probably going to be more of the same crap.