I dont use anything platter based anymore other than the drives connected to my X1X and PS4P. All my Macs and PCs are SSD now. But yeah 11.x ran amazing on my 2012 lineup MBP/Air/Mini.Mine has an SSD too (with 16GB or RAM) and Big Sur was possibly the smoothest OS I've ever run on this machine, certainly better than Mojave or Catalina. Not sure how it would work with an HDD through.