If you're a linux user for that long you've probably got experience updating CLI utilities. That's all that's required here, simply installing a new openSSH. I

If you're a linux user for that long you've probably got experience updating CLI utilities. That's all that's required here, simply installing a new openSSH. I recently made the transition (from ~10yrs Linux) to Mac and it was really smooth. At the end of the day it's just a Unix system with a really nice looking Window Manager and lots of supported apps. If you don't like the included version of SSH, just use a different one, same as linux.