Makes perfect sense to me. You are not supposed to write Wikipedia articles on your original research.

If you want to help Wikipedia, feel free to write articles based on work that other people did in your field. Don't add any conclusions of your own. Let someone else write the articles on the research that was done by you.

I think that is a very reasonable tradeoff.

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> if an editor writes the same content and cites the same sources, that's also OK, even though I'd argue that's plagiarism.

An editor should not copy your blog post. They can describe whatever you wrote about and cite your blog post as a source. Or, they can go after the same original sources you have cited and write their own summarizing article (but not copy the blog post, and they also can't add any of their own conclusions).