so maybe ten hard drives aren't required for most users anymore. Just four drives with 14TB space is a pretty BIG server for most users.
Also I think NASes are currently in vogue. Some users will go that route.
I don't mean to offend you, because I respect you, but ... those comments make me think that "you don't know the NAS user crowd", at least, not the "ServeTheHome"-type crowd, people like our own Red Squirrel with rack-mounted gear. Some of those guys have PB or by now, maybe even EB of data.
Sure, some people just want something simple, to use as a network backup destination, and maybe share a few photos with friends. I get that, I do that too.
But some people are insatiable users of storage space, and even the bigger drives, well, gotta have more of them. Hence why I predict that new Asustor "Lockerstor 10" to be a BIG seller, especially with the dual Intel 10GbE-T and dual M.2 NVMe slots. (VM station, here we come. Even has an HDMI output.)
I kind of fit in-between. I want to make backups of my optical disk collection, and have space for my Linux ISOs and whatnot, along with my personal crap and system backups. I don't really have an insatiable need for storage space, I don't download a heck of a lot anymore. Most anything you want is available streaming these days anyways, or on YT.
I do believe, that you (royal You), outgrow your storage needs over time, and thus, with NAS, it can pay in the long run, to "go big or go home". Thus whichever route that you choose ("Lockerstor 10", or X370 TaiChi / FD R6), ten drive bays plus an M.2 or other SSD connection, is a NICE option to have.
Edit: Oh, and just a comment, single-drive bay "NAS" units are for clueless Noobs. (Yes, I was one once, I had some single-drive NAS units to start off with). But most people at least want
some reliability, which generally means, redundancy, so 2-bay NAS unit in a RAID-1 mirror, minimum. Yes, that means that you have to purchase TWICE the storage space that you'll actually need, and lose a bunch due to decimal-to-binary conversion, and formatting. Boo-hoo. "Proper" NAS is NOT CHEAP. Though, some options are more expensive than others. (You pay for "Cute"-ness.)