And the prices on the SSD don't just get you an off-the-shelf Samsung SSD from Amazon, we're talking the fastest SSDs on the market by an absolutely massive margin.
Which aren't in laptops anywhere so it's pretty irrelevant in this instance. It's also the case that the T2 chip is running real time encryption/decryption on reads and writes.
https://www.laptopmag.com/articles/2018-macbook-pro-benchmar...