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Yes it is a NAS and it is cheap and convenient to repurpose hardware.

But for anything where your data is important isn't ECC memory still critical for a NAS in this day and age?

Yes, and my desktops utilize ECC too for that reason. I only lack ECC in the places it's really difficult to avoid that tremendous drawback.

E.G. a Steamdeck is or smartphone are both relegated as toy devices that are not for serious computing.