The larger discussion about whether or not package maintainers have a responsibility to minimize user frustration at the cost of their own opinions and practices is worthwhile.

If I'm the author of an unpopular module, where I am the sole user, and I don't like semantic versioning or some other facet of package management, I don't follow it. Should I be expected to change my stance just because other people begin using my project? At what point is my project's community large enough that maintaining a healthy ecosystem involves sharing some control over the practices with that community?

It also doesn't help here that rather than having a rational discussion, the author released what can only be described as a troll package, where every version change becomes a major version. Using that would be the height of insanity, as noted in the issue thread, because all libraries would need to update their dependencies and re-release with every Underscore-semver release, due to dependency version conflicts.