Yeah, none of the stuff I was complaining about really applies if you are runnnig Roon on the NAS itself—since then there is no networked filesystem involved.
The main caveat with running roon on a NAS is that many of them have underpowered CPUs, and it is easy to end up with Roon’s database on a spinning disk, which isn’t great…but both of those are surmountable by making good hardware/configuration choices.