I would distinguish people like DJB from people like say, JWZ or Lennart by the fact that the latter do actually adjust "their way" in the light of revelations about the workings of the universe (or say, the Linux kernel). The response to calm explanation of why Lennart is wrong is usually either a change to how his software works to accommodate these new facts or at least documentation showing how you can adapt his software to this viewpoint (and if you're right that's what everyone will do, probably including Lennart). With DJB what you can expect is a manifesto calling for all operating systems to be re-written, cultural orders to be overturned, and black to be declared white in the service of making DJB's software work as he intended.
George Bernard Shaw said that all progress depended upon the unreasonable man, but clearly there's a line beyond which no progress will be made because too much effort is expended on tilting at windmills. I think Lennart stays the right side of the line, mostly.
The main issue for an administrator is that systemd is different, which means learning new stuff. If you are (or employ) the kind of sysadmin who spends weeks cursing every minor change in common Unix tools, filesystem layouts and so on, then I have no doubt systemd will be a problem.