Fast M.2 SSDs (e.g. Samsung PRO series) are almost as expensive as Apple's proprietary SSD that you can find on the market. It's a fair point that one cannot op

Fast M.2 SSDs (e.g. Samsung PRO series) are almost as expensive as Apple's proprietary SSD that you can find on the market. It's a fair point that one cannot opt for cheaper M.2 SSDs and has to either settle for the very high end or cheap SATA.