Yeah... Never had a specific "server" certified hardware and always repurpose my hold hardware stuff. Never failed me !!
However, there are some functions specific to NAS' like low power and other stuff people mention but I already forgot.
IMO all this NAS and certified server stuff is good for Enterprise shit and the like... But for homelabbing it's probably overkill and way to much overpriced for the little gain...
Except maybe for the ease of use and plug and play function? Each one it's own I guess !