Because "we" really like em. I understand people getting something else but I will hold on to my 2015 iMac until it dies because the only interesting thing in the eh "updated OS's" is Stage Manager to me. I'm sure the newer machines blow the doors off the 2015 iMac as far as speed but I don't mind waiting a few seconds/minutes. I'm sure there are people that get all excited about the incremental updates with the chips and etc...but wake me when the software gets an eh upgrade. I'm sure the OS's have been upgraded to some extent. I've been using Macs since the performa and the PR has long worn out on me. I do understand others will eh "think different" like 8 of ram and 256 of storage is okay and etc...have at it
. We use to be consumers now we are the product.
Don't get me wrong, I'm not bashing Apple but I will hold on to this sometimes painfully slow puter until it dies.
I mean, if that's your perspective, what I'm hearing is that you wouldn't buy an Apple Silicon 27" iMac even if Apple put one out tomorrow. Please don't take this the wrong way, but it feels as if you've made 27" iMac ownership into sort of a tribal identity thing, and you'd like to see the tribe continue on even if you have no intention of upgrading.
My perspective: the 27" iMac was always an awkward solution to the problems Apple created for itself (and us) by ratcheting the price of Mac Pros ever upwards. It filled the moderately-priced high performance desktop slot in Apple's product lineup, but with a lot of compromises forced by trying to cram a high performance computer into the enclosure of a LCD monitor. We are better off with the computer in a separate box. (I, for one, do not miss the way my 2019 i9 iMac loved to imitate a jet spooling up its engines for takeoff at the slightest provocation.)
Are there problems with how Apple replaced the 27" iMac? Sure, as I believe I mentioned before, the price of a Studio Display and an entry level Mac mini is higher than an entry-level 27" iMac used to be, and you could upgrade that iMac's RAM with third party RAM.
But these are not issues caused by putting the computer part in a separate box, which is where it should be. They're just Apple being Apple, with a side of inflation. If they'd chosen to build a 27" Apple Silicon iMac, it wouldn't have expandable RAM and they'd have figured out how to charge you more for it.
So, I'm still puzzled by the persistence of 27" iMac fandom. It wasn't a great design which had good reasons to exist, it was just the only option Apple offered for a while. They now offer other options which should have (IMO) broader appeal.