I get that for a boot / root drive but not for building a self hosted storage system. I'm not taking about cost of SATA SSD vs NVME; I haven't seen a lot of boa

I get that for a boot / root drive but not for building a self hosted storage system. I'm not taking about cost of SATA SSD vs NVME; I haven't seen a lot of board+enclosure options that take enough M.2 disks.