Here is a small list of things that broke when I upgraded.
My timer for recording podcasts. (got a new one)
My seriously old version of Photoshop. (I have a newer version that I’ve been waiting to install)
My recording software as a whole. (I have a backup that I just NOW got to work)
Is it enough to make me regret the upgrade?
Not in your life.
I expected things to break so no surprise there. The operating system is working great for everything else. I love “Mission Control” and think they finally got “Spaces” right.