That, or

    Harmful things            Less harmful alternatives

    <thing that is       >    <thing that is          >
    <not Plan9 / OpenBSD >    <Plan9 / OpenBSD        >

Most interesting thing which sheds some light on the list is: "At the moment a detailed rationale is not provided for most of this, so figuring out why some things are considered more or less harmful than others is left as an exercise for the reader. Here is a hint: complexity is the bane of all software, simplicity is the most important quality"

I do have to say I agree with a large part of the Harmful list, but I recognize those things are not actually harmful but just personal preference.