Catalina; not their best effort
Catalina's a bit of a mess. Loads of bugs compared with previous versions, especially by the time it reached the 4th update. Problems here include:
* Crashes - almost Microsoft levels of crashes, generally on waking from sleep
* Display driver problems - secondary monitors intermittently blank on waking from sleep, flickering hue; incorrect contrast
* Sleep problems - like won't sleep
* Airplay problems - unreliable connections
* Security and other changes means lots of time messing around answering silly "security" popups - very MS like.
Really not their finest version. That there's SSH problems doesn't surprise. The loss of some 32bit utilities also annoys.
Stuck with Catalina because a 16" machine depends upon it.