My 2012 MBP is still pretty great, but newer MacOS releases have put a strain on reliability, for me at least: When plugging in an external display while it's asleep, there's a significant chance it won't wake up without a forced restart.

"Your computer restarted because of a problem", and subsequently having 20 apps open up on login is the bane of my existence on MacOS. Same issue with my work touchbar MBP.