There isn’t much market demand for an extremely low power chip with excessive PCIe IO and a ton of RAM because most applications with high RAM and IO requirements are going to be very power intensive.

It’s already possible to build an Intel system with plenty of RAM and IO where the CPU doesn’t take much power.

For building a high capacity NAS you don’t need the throughput of PCIe for all of your drives. Cheap SATA SSDs can easily saturate your network link when used in parallel.