Upgrading to 15.2 was a disaster for me.
My main dev machine is an Intel Mac Pro — lots of RAM (96Gb), terrabytes of SSD space, two large displays, etc.
Upgrading to 15.1 seemed to be fine some months ago. However, upgrading to 15.2 essentially killed my machine and even after I gave up and brought it to Apple who “claimed” they fixed it because they were able to install 15.2, they actually hadn’t - they just brought it to the point where you type in your apple ID and that’s where things were failing.
To cut a long story short, after installing 15.2, the system couldn’t see most of my USB ports nor my second screen. I couldn’t even type a password in using a keyboard that was explicitly plugged into it. Supposedly there is an option in preferences to “Allow accessories to connect” but that option doesn’t show up on my Intel Mac Pro (it shows up on my laptops!)
After wasting (as of now) 4 days where I couldn’t do any real dev work, I finally managed to get it back to Catalina (which was what it originally came with) and up to Ventura, which is what I had been using until recently.
Fortunately I have backups of all my data and applications so I just have to restore as much as possible to get back to business.
What a headache!