Earlier quoted context omitted.
And in those workstation class laptops (that use NVMe PCIe SSD), do you only pay 50$ more to upgrade from 512gb to 1tb? No one is saying those SSDs are Apple exclusive, they are however expensive.
It's about $100 more to go from 512 GB to 1 TB, and these are better than what Apple puts in their machines. https://www.mrmemory.co.uk/ssd-upgrades/lenovo/thinkpad/p1
They charge 450$ retail and 250$ on special for a slightly slower SSD