Having an operating system where the kernel and core userland are developed together is a qualitatively different experience to one that's been stitched togethe

Having an operating system where the kernel and core userland are developed together is a qualitatively different experience to one that's been stitched together from external projects. I'm not really sure how to describe the difference in experience but the "this is an integrated whole" feel is really quite pleasant as a sysadmin and as a user. Note that my personal infrastructure is a mixture of Debian and FreeBSD and I dearly love both - if you forced me to pick one of the two to keep I'd be horribly torn.