Strict separation of configuration and shell-scripts means that you have two folders for either configuration (/etc/conf.d/) and shell-scripts (etc/init.d). This is unique and is actually a feature systemd doesn't have, because it has a different approach (I don't want to evaluate this in any way).
Points you are missing is that power-consumption is already levelled sufficiently in the device-specific ALSA-drivers in-Kernel and that Jack is a Daemon not entirely situated in user-space, but also incorporated into the Kernel (which gives an insight into how the Linux-devs might look at PulseAudio).
Concerning security, I would definitely choose an interface which is part of the Kernel and the highly-efficient bug-tracking system of it than some interface developed by a handful of individuals who strive for a certain appeal of reinventing the wheel.
I also don't quite grasp how PulseAudio is supposed to save energy when it builds upon the ALSA-interface anyway. How can a sub-element of something be less efficient than it? Please tell me.