I keep saying backup, and other people keep re-saying NAS. These are different.
A NAS can serve as a backup.
Not all backups are suitable as a NAS.
Now, let me restate: Most people have no networks capable of significantly more than 1Gb/s between two hosts in their house. Complaining that a backup server is also attached at 1Gb/s is not going to cause people to discover that they have already purchased 10Gb/s switches, or LACP switches, or even acquire 2.5Gb/s switches.
Of the people who have 10Gb/s switches in their house, approximately none of them are going to look at this very low cost, low performance, low power system and say "yes! this is my new primary backup system!"