Correct! It's fun to control the whole stack. And while I've been programming on POSIX systems for over 10 years, I've learned more about POSIX programming in the last year than in all the preceding years. There's no better way to understand something than to implement it.

And staying within a Unix-y paradigm means that if some part(s) become too good, they can be semi-easily ripped out and turned into portable libraries/programs instead.