>If you ever have written a /etc/init.d script for a python non-daemoning script running in a virtualenv, or something to the same effect, you'd notice the improvement over SysV init scripts.

These are solved problems. You're creating a bunch of low level OS spaghetti because you don't want to have to write a shell script for your software? That is not a responsible decision-making process, that's moving the mountain to you.