I had to send out warning emails to my family members (mostly newbies) not to update yet, and a couple did anyway and are having small issues.
Apple is making it difficult to avoid upgrading. Yesterday I unlocked my iPhone, got a screen telling me the phone was going to be upgraded while connected overnight, made me enter my password on the keypad… and the only thing stopping it was that I refused to agree to the ToS page that then popped up. (And I have automatic updates turned off!). And I’ve got an annoying little red “1” staring at me in my Mac’s Software Update now.
With one exception (last year’s macOS release) I’ve usually waited until the x.3 release before upgrading, even if that meant waiting 4-6 months after the OS came out. Generally speaking, it’s been a solid policy and has let straggler apps (most especially music-creation apps) make themselves compatible with the new release.