Hence why even on UNIX people moved on from NFS, but on Linux it keeps being the remote filesystem many reach for.
Contrast that with NFS, which last I looked needed several config files, matching account IDs between hosts, mounting as root, and would hang processes if connection was lost. At least I hear rpcbind is gone these days.
I don't think anyone sane uses NFS on Linux either these days. And it is rather funny that the protocol Microsoft invented is what stuck and became practical between Linux hosts.
Synology, TrueNAS and Proxmox probably also have NFS support I would assume, and they definitely have Samba. Those are more relevant to me personally.
I just run a normal headless Linux distro on my NAS computer, I don't see the point of a specialised NAS distro. It too could have NFS if I wanted it, but it currently has Samba, because it is easier and works better.
So in conclusion, I'm not sure what your point is? Doesn't NetApp support anything except NFS?
For me NFS is easy and works better, edit two files, enable NFS and update firewall. I had NFS running before SMB, and if I am at hobby level I prefer http if it is good enough. There are technical reasons to use SMB, HTTP, NFS or Ceph. The easy to use options is just a function of how much you know, what you have run into and what you NEED to do.