I just updated my mid-2015 rMBP kinda/sorta. I was doing two partitions, Mojave for PT Ultimate 2019.12 and Monterey for email, bills & such. I had just bought a perpetual Pro Tools Studio so I ended up going with macOS Catalina 10.15.7 because it's compatible with PT Studio 2022.7 and most of my VI libraries. Just because there are updates doesn't mean we need them, if your Blackmagic software does what you need then why update? If there are new features you need then by all means go for the update. My PT Ultimate is still alive and well on a Win 10 i9/64Gb/18Tb PC so I haven't lost anything going to PT Studio 2022.7 on the MacBook as it's for MIDI/songwriting/remote recording and that works fine as it stands. Anyhow good luck with your endeavor, I'm still installing VI libraries. I had to but an external 1TB NVMe drive to get all this crap on here.
