I'm still using a 2010 Macbook Pro with a 1TB SSD for Logic Pro and Mainstage. Does it struggle? Yes. Does it work? Yes. It's still amazing technology that makes my keyboards and guitars sound bananas. To be fair, I just muck around with it, but it still has more than what I'll ever need or be able to discover.

Yup, I use Logic 9 on my 2013 MBP running Mavericks or Yosemite or something (I forget which offhand). It's astonishing just how bad the newer OS versions are. "Don't fix what isn't broken", in this case means never updating that machine so I can not only continue to use the software I paid for, but also so it doesn't get completely ruined by the massive degradation of quality of the newer "upgrades".