net/wireguard-go: is it useful?

[Greg Troxel <gdt%lexort.com@localhost>]

DESCR says "This is an implementation of WireGuard in Go."  Which
leaves out what it actually does.

  - If I build it on NetBSD 9 will it work? 

  - If I build it on NetBSD 10/current will it work? 

  - Upstream talks about wg(8). NetBSD 10 has wgconfig(8).  NetBSD 9 has
    nothing even close.  Do you need to install ../wireguard-tools?  Why
    doesn't it depend, at least on systems where that's necessary?

  - Should I expect that things like tailscale can drive wireguard-go?

And then: wireguard-tools is from 2021.  Is that really how things are?