My personal Macs (a 2011 iMac and a 2009/10 MacBook Pro) are both hacked to run Catalina even though they officially tapped out at High Sierra. I was a fan of High Sierra, but wanted to make the pair last a little longer before officially throwing in the towel and switching to Linux. Catalina was not great, but I wanted to make sure that I was getting the latest patches for as long as possible. At work, I use a 2017 MacBook Air and we just updated to Big Sur and boy, oh boy is it making Catalina look better and better.