Not saying the price is not outrageous but I found it ironic that you spec maniacs can’t tell the difference between a sata ssd vs pcie ssd. You will be hard pressed to find retail ssd that’s remotely close to the performance in these new macs.
https://www.amazon.com/Samsung-860-SATA-Internal-MZ-N6E1T0BW...
That isn't a performance monster. But you could get something really top-of-the-line for, say, $400.
That said, Apple should not be sodering these SSDs to the motherboard.