Wikimedia Bugzilla is closed!

Deleting the text from the article and converting it to a redirect page still leaves all the categories in it, as well as Other Stuff such as magic words and invisible templates.

This is a regression in comparison to the source editor, where the editor could just delete everything and be sure that categories, magic words, invisible templates and everything else is gone.

Just redirecting an article shouldn't necessarily remove everything, because it's actually possible that the editor wants to leave the article in a category. Some projects, including enwiki, have categories, templates etc. in redirect pages. But probably some kind of a warning should be shown.