"In case of systemd, the approach is to wipe out everything and replace it with something completely different."
Which is simply not true. On my systems there are still a lot of init scripts still in use despite using systemd as init. None of our own custom init scripts needed even a single change. But of course we will replace them by real systemd unit files at some convenient time.
"That's not a big problem. A big problem is when I get WTF face from my sysadmins. :)"
Well my dad _is_ a sysadmin with decades of expierience with Netware and Windows. Stupidly overcomplicated things like SysV init scripts almost made him give up on Linux and stay with those systems. Because really, that 17 years of experience with something so mundane like the way to start and stop services on a server actually are worth something shouts that there's somthing wrong with the system.