Fair enough. You’re absolutely rght–you can get into some pretty deep weeds with a NAS. However FWIW, if all you want is fast, redundant and expandable storage, it’s really simple. You pretty much just point your computer at the NAS and it shows up as a drive like any other. The biggest barrier is the initial expense.
Edited to add: Although, i see that even that’s not too onerous if storage needs are simple. You can get a NAS and two 4tb drives for sub $400. Not bad at all.