> The memory used in Apple laptops is not the same type of memory that you find on a DIMM. The architecture is more like a GPU, with high-speed memory placed as close as possible to the CPU.

That was a design decision too. It's not that they bought a chip, they made it themselves.

> It's not reasonable to expect Apple to compromise the design of their system to cater to the vanishingly small minority of customers who demand such features.

I repaired an upgraded dozens of laptops for friends and family, extending their service life for years. Less rare earth in a landfill and more money in the pockets of my acquaintances. The "small minority" is "vanishing" because people are being trated more and more like consumers that throw away the current toy to buy a new one. Companies like Apple are the root cause to this. They want this.