"While the traditional approach may work alright for a static setup like a server that is booted once and stays on forever, it's not good enough for a desktop, laptop or mobile device."
Sorry for sounding like a troll, but what you're saying is that the traditional approach works alright for setups where unix is actually good, and doesn't for setups where unix is actually crap.
Lets exclude mobile devices from this picture (because those don't use general purpose Linux distributions and arguably don't use unix at all, but a unix-kernel with specialized - non-unix - userspace) and concentrate on servers and desktops/laptops...
This systemd rage shows exactly why it's 2014 and while Linux is extensively used and trusted on the server side, it continues to limp along on peoples' desktops: it constantly reinvents the wheel (badly) with monolithic pieces of bloatware that are usually throw away tried-and-true solutions for unproven experiments. It throws away the old way of doing one thing and do it well in favor of components that do too much and become so complex that troubleshooting is a nightmare, exactly the kind of complaints we have about non-unix systems...
Need an example? Where are the people that used to criticize the Windows registry now? I just recently almost(1) had to throw away my entire home dir on Ubuntu just to try and reset Kontact, because in this day and age the configuration structure of this stuff is far worse, and it's almost impossible to separate one component's configuration files and folders from everything else. And I'm not even going to start ranting about how in the name of $DEITY a mail/calendar application needs MySQL running in the background and about there is not a single decent mail client for Linux right now. Mail... a decades-old problem!
I don't object to systemd itself, but I do object to systemd invading my servers that work just fine without it.
(1) "Almost" because I just learned to live with the occasional crashes and misbehavior caused by some pieces of old configuration still lingering somewhere.