[off the wall]

Originally Posted by JFreak

Hats off.

However any experience of legacy Mac OS does not count in this case. OSX is UNIX and your experience starts from 2001 just as anyone else. But being around so long you have first experienced transition from 68k to PPC, then PPC to Intel, and now Intel to Apple Silicon. That is something.

I have however been troubleshooting PT systems just as long, and one thing I can say is any random trouble has a root cause in making automatic migration or in-situ upgrade. Challenge my opinion or not, we both have right to our own.

All good. I'm not challenging anyone in particular, just offering an alternative approach. If a system is running trouble free before an upgrade and you've ensured that all installed software is compatible with the new destination OS, it really can't hurt to do a CCC clone and try a migration first. If you have issues, then go the clean install route. If no issues, you're done and back in business ASAP. If you are supporting a lot of machines, you will save you and your clients time and $ in the end.