> I appreciate that as well, but SD cards still aren't the same as old game cartridges. On consoles up to the Nintendo 64, plugging in a cartridge expanded the physical memory of the system, and the CPU read data directly from the ROM on the cartridge. This is why there were no loading screens.

SD Express is just NVMe over a PCIe lane, so you'll get to do all sorts of fun DMA tricks when it starts becoming more popular.