The only huge problem that the team has still to solve is to make this node-stuff an easy and friendly process which everybody can easily setup and not just something for nerds. For example, I could not setup a node on my Windows based PC. I guess, I am not the only one.
I think the priority for nodes is to make sure the system is secure, which based on the number of nodes, it probably is. If windows is deemed less secure than linux, or too difficult for the system to deal with two operating systems, then we probably won't see user-friendly nodes on windows make an appearance.
I actually haven't been able to find any coins that do nodes through windows. It possibly doesn't exist and not sure zencash will look into it separately.
I dont see them using that much of the developers time to make it work easy on Windows. And if you have to invest time in getting it up and running it is more likely the node will stay on for a longer time.