I think the idea is that you're supposed to build a system to manage WireGuard using that sort of information. I.e. WireGuard provides the basic primitives and second- or third-party tooling uses them.

I like that idea, because it means that the actual WireGuard core is small and it's usable right now. It is annoying that someone hasn't yet developed neat integrations for WireGuard and stuff I might want to use, but — I'm someone! I (or you, or whoever) can build something, and as surely as day follows the night someone else will build some neat things in the future.

It's early days yet!