So, this is the problem, you can easily say something is sufficient but it might not be neccessary, or vice versa, implying the converse is often not true. It's does seem silly, but you're right a lot of conservative hackers are anti-systemd, but the converse really isn't true, I don't even think it's like "here are some exceptions" rather than most of the anti-systemd crowd are not reactionaries.

Also, "conservatism" meaning "if it ain't broke, don't fix it" is NOT equivalent to political conservatism at all. Conservatives all the time advocate for changes that contradict tradition all the time. Just look at the zoning debates in the US, none of the "keeping X neighborhood sfh" people who argue for it because of "preservation" want to minimize parking to the point they can't fit their f-150s anymore, which dwarf the trucks of the 50s. It has a veneer of "respecting tradition" but they don't really care about tradition in the strict sense. It's like most political ideologies, it centers on a set of values and ideas with justifications that come later.

The left really is the same honestly. While "progressivism" has a nice summary as being "for political change" in some respects, they too respect tradition and history when it fits their aims. It's more correct to say that the sides really have a set of values and ideas that are central, without some overarching central tenet or explanation.