systemd was adopted on technical merits? Probably. Do these technicals merits affects me? I tried and used systemd before any distribution adopted it. Then I noticed it broke stuff I relied on and wanted to switch back to another init, because why not, eh? And then I found out people around (like KDE, like provided earlier) remove code and functionalities of software because it would make a duplicate with systemd. So switching back was no longer an easy option.
And many of these functionalities are way beyond the scope of an init system. It is almost a system. So that, for me, itself, raise quertions.
The rm -rf /foo/. might be insignificant if we were talking about a guy that contributes to an init system. It is quite different when it is about one of the guy that have a say on the system that gradually all other software depends on.
As you said "underpinnings of a large part of the OS". It is not about an init anymore.
Fact that a new init system is welcome does not mean that it is so great to have a new system on top of GNU/Linux, much more than an actual init system.
When considerable amount of software regress (upower, etc) because their functionalities are now handled by systemd, in an effort of rationalization, for distros, it does not make much sense not to use systemd, because it forces them to chase all these regressions that are being made day after day. Which mean working just to keep things as they were, instead of improving anything.
And it is not like a new thing in the libre software community, to write a blank check to some crowd (Helixcode, Eazel, etc) due to marketing and promises more than results while there was obvious warning sign to where it would, in the end, lead (and which it did - kind of joke to have GNOME, part of GNU, led by people that ultimately were releasing proprietary software).
I wont get in details about sound. In the past, it was shitty to set up but once it was set, it was working reliably. Not my feeling right now. At least, old audio system was not providing functionalities while advising not to use them (PulseAudio as a system daemon). Here there is a pattern about the development process (writing code you want people not to use? why? because you need to pretend there is no regression?).
Finally, what is the meaning of your last sentence? Is it not allowed not to enjoy systemd until you wrote yourself some systemd? I need to be president of the USA to have an opinion about president USA ? I need to be famous singer to like or not to like some famous song? WTF.