ECC has been growing in support since ~12th generation Intel (currently 14th) and before that for AMD I think, so it is only a matter of time before this trickles down into the little NAS boxes.
It is? How so? I don't see it anywhere outside their server and embedded products. The server-grade stuff isn't appropriate for "the little NAS boxes" used at home because of both expense and more importantly power consumption, and the embedded stuff just isn't really available to consumers (so it might be potentially great for a company like Synology that builds consumer-friendly pre-built NAS boxes running on proprietary software, but it's not useful to people building their own DIY NAS boxes running open-source software).
Yeah, that cost puts it out of reach for the typical home users building relatively inexpensive little DIY media server boxes, and places it firmly in "server" territory. A standard motherboard for these CPUs (typically using a B760 chipset) is a very small fraction of that cost.
It's good to know this factoid, but it still basically supports my prior assertion that on Intel, ECC support is basically only for servers.