I am still drawing a different conclusion.
My first priority is to have packages just do the correct thing when one
runs "./configure; make". It's a real treat when it works that way and I
don't need to spend 30 minutes reading the Makefile and patches to see
what I need to reproduce when building things outside of pkgsrc.
MKYP is extremely esoteric, so there were issues with it. That happens.
I don't think MKNVMM needs to exist. It's a kernel module and a small
library. And if someone added tunables for many things in NetBSD I don't
think it would look pretty.