I'm not sure if this is what the parent means, but i kind of feel like the tags vs categories debate.

MediaWiki uses the term "category" for its system of tagging pages. This generally is used as a very complex system of hierarchy with many nested levels and prescribed "correct" categories.

Some people think we should use "tags" instead (e.g. less nesting and more intersecting. Instead of a category "People in Belgium" use a tag "People" and a tag "Belgium" and apply both).

On a technical level the feature requirements are basically the same, but the word tag and the word category have such strong connotations that the mere name strongly supports one social organization over another (imo)