The thing is, if you're writing software with a lot of breaking changes, SemVer doesn't make much sense, because you'll just quickly get to major version numbers in the hundreds.
“The version number conveys whether there is a breaking change” seems more important than “the version number remains small”, so while the second half may be true, I don’t see how that supports the first half at all.
Is version 465 very different from version 464 though?
Still, it's great to see new maintainers with bold ideas.