I don’t know if you have ever used or looked at QVR Pro. It’s actually quite a nice app and is not a “Marketing Checkbox” application.
If you want to use a NAS just for storage, then you need no more than an ARM core in one of the cheap NAS units QNAP makes. That’s fine. But the nicer boxes can do way more than just store files. That’s one of the cool aspects of them.
But to each their own…