why- Open BSD .rocks

Kernel & Userland (∞)

The kernel and userland in OpenBSD are developed together. The same people who introduce new features to the kernel control the userland.

This way, new features can be implemented very fast into all of parts of the OS. See pledge, for example. As Linux Kernel and GNU Core Utilities are developed independently, it would not be possible to introduce pledge to all the tools that easily.