That's funny, because I never claimed that. I don't even think that in the first place.
Whatever hardware they bolted on to the A12Z developer kit that the standard A12Z didn't have. There isn't a lot of discussion on how exactly the DTK worked, but there is a short outline from Tobybrut that explains it somewhat:
"A-series has no virtualization built in because it was never needed in iOS/iPadOS until Stage Manager. They cobbled together a development kit using the A12Z because the M1 didn't exist yet. They had to use all sorts of kluges and co-processors to manage virtual memory, and even with 16GB, ran atrociously bad. It's a system that would never have been shipped, so you can't use a crap developer system as a model for A12Z virtualization. Anything the M1 could do that the A12Z couldn't had to be offloaded to other processors in that dev kit.
People make the bad assumption that a computer is nothing more than a CPU, RAM, and a graphics card. Apple essentially had to emulate the presence of a chipset (e.g. Northbridge and Southbridge) that would normally accompany an Intel/AMD processor on that dev kit. All that chipset logic was built directly into the M1 and later SoC's and is absent from the A-series chips.
How Apple kluged virtual memory, we don't know, but it certainly runs worse than dedicated hardware, which is why SM is limited to only half of what the M1's can do."
I think you misinterpreted the original post of mine so hard that you are now having to put words in my mouth to justify your interpretation. I never claimed the DIMMS were different. 4GB of RAM is not desktop class, but 8GB or 16GB is.
What I was saying in my original posts was that just because Apple silicon originated in mobile devices, doesn't mean the Macs are missing out on anything - Apple put any specific silicon into the M1/M2 that Macs required. I was actually highlighting that there isn't much difference in the first place, not saying that M1 is some amazing jump from the A13/A14 before it. That's why I've found this so bewildering.