Here is my take, IMHO. I recently purchased 2 used 2015 27" iMac's with 32GB RAM, 2GB GPU, internal TB SSD's (1TB and 2TB upgraded), both for a total of $550 (in near new condition). Where else can you get 2 5K screens for that price. Granted, they are not as powerful as my Mac Studio M1 Max or my Mac Mini M1, but the content editing/photo editing I do, probably in line with 90% of most people don't require that much power from the newer M1/M2 systems. I recently rendered a pretty decent size content, the Mac Studio only rendered the 1080p content slightly faster than the iMac. Let's see, Mac Studio M1 Max $1700 (Approx), Apple Studio Display (Approx) $1499 equal $3298, iMac $250, and what did it get me? A slightly faster render time. This is not rocket science, according to my calculations; it cost me $513 per minute (equipment performance) for the faster render time? The older iMacs are worth it and more, IMHO. Oh, I forgot to mention that I used Open Core and upgraded both systems to Sonoma, and they run and perform with no problems at all. As mentioned earlier, they are not at the same performance level as the newer M1/M2 systems; however, they can do 90% or more of the work most use their systems for, it may take a few more minutes to render/photo edit. But what the heck, I'm sure the huge majority of users are not even close to using their systems in a professional way? Excellent content BTW.