Ha ha for some of us that’s our world now!
Those of us stuck on Catalina (like my 2012 mini) just got
a) Security u/d,
b) compatibility patch for iOS and
c) Safari 15.1 (I installed that a few days ago.
Kinda sad my top end mini didn’t make cut for Big Sur or Monterey, it can for sure handle the processor and memory requirements.
Still hopeful a small update will come to enable hide my email functionality within Catalina macOS.