This was originally meant to be posted at rakudo/rakudo#5390. Since I have put effort into it and I do think there is thought in it, I decided to preserve it despite the blockade thrown into the way.
Anyways. There's the blog post and the discussion. The fact that Slang::Otherwise has 5 stars on Github is some indication that the repo is appreciated by some people at least.
I'm not arguing against the existence of a slang. I'm arguing against throwing it into the core language, let alone by a mere PR. I don't think the discussion even looks so clear and one-sided from a neutral point of view, and I think I have seen this article before.
I would like to respond to the article itself in this comment... that will be enough for now I think.