Speed (IOPs), increased reliability, compactness.
If your application does not needs those you can go with legacy solutions as far as price justifies.
Sooner or later even price will be in favour of all-flash
You will understand clearly having a look at:
https://www.backblaze.com/blog/whats-the-diff-nas-vs-san/> https://www.backblaze.com/blog/whats-the-diff-nas-vs-san/
https://www.enterprisestorageforum.com/storage-networking/nas-vs.-san-differences-and-use-cases.html
