Um I'm not sure this is strictly correct. I, until recently, was running a 2009 Chesse Grater with SSDs and that ran extremely well using OCLP, my wife's 27" has had an SSD transplant and it runs extremely well, heck my old 2011 27" also has SSD and it runs really well, I have a 24" iMac (2008) also with SSD and it runs surprisingly well to (needed for old wide format printer). Every Mac I have installed and SSD into to replace a HDD has been used for many years after the "OMG this Mac is so slow" cry for help.
I think you can see the pattern - SSD will give all machines a significant performance increase in real terms - not just spec sheet terms that we see with modern machine relative to old(er) machines.
SSD is the biggest bang for buck upgrade to any machine that this can be done to that has a spinning disk PERIOD
FWIW I currently run a MacMini M2 Pro (couldn't justify a Studio) and M1 Air as a daily