It’s possible that Apple really did a disservice to soldered RAM by making it a key profit-increasing option for them, exploiting the inability of buyers to buy RAM elsewhere or upgrade later, but in turn making soldered RAM seem like a scam, when it does have fundamental advantages, as you point out.

Going from 64 GB to 128 GB of soldered RAM on the Framework Desktop costs €470, which doesn’t seem that much more expensive than fast socketed RAM. Going from 64 GB to 128 GB on a Mac Studio costs €1000.

Ask yourself this: what is the correct markup for delivering this nearly four years before everyone else? Because that's what Apple did, and why customers have been eagerly paying the cost.

Let us all know when you've computed that answer. I'll be interested, because I have no idea how to go about it.

I had 128gb of ram in my desktop from nearly a decade ago. I'm not sure what exactly Apple invented here.

Yeah, it's not really about jamming more DIMMs into more sockets.

Of course it isn't... the point stands... Apple didn't actually invent anything in that regard.