HDDs that support NVMe are the minority and even then, PCIe riser cables are more expensive than SATA cables so you are wasting money on capabilities that a NAS

HDDs that support NVMe are the minority and even then, PCIe riser cables are more expensive than SATA cables so you are wasting money on capabilities that a NAS doesn't even need. Even if you think an SSD based NAS is a good idea, you still need to backup that NAS onto HDDs at which point you run into the same problem. How do you plug them in without SATA? Oh and by the way I bought SATA SSDs in 2018. SATA 6Gbps is quite an impressive standard given that it runs at such a high frequency and yet supports long cables unlike PCIe.