Originally Posted by chucker
To be fair, you may get a 4 TB SSD for €1k, but it won't be the same speed as Apple's.
Correct. That 4TB SSD €1k is a 2.5" SATA drive, and the fastest of those is about 550 MB/s. PCIe NVMe storage is frickin' expensive, and Apple's implementation runs at 3GB/s; plus they have their own SSD controller in the T2 chip which makes it even faster/more efficient for Mac OS.