I see this like zbruh. There's nothing wrong with creating a package-managment thats perfectly integrated and tailored for our distro. So we don't have to deal with software thats not developed for our needs.

Thats why we start creating a distro; because we want some kind of OS that contains exactly that what we need and what we want. And if we use a "not-self-made-packagemanager" then we do not need to create an entire distro.

//edit

Contains pkgsrc everything a distro needs, or do we need precompiled packages? I used pkgsrc one time on Arch and was not able to make an entire Linux distro with it.