A couple of days ago I was looking for algebraic geometry questions to answer and this question appeared in my feed. It has nothing to do with algebraic geometry, so I wanted to remove that tag in order to make it better reflect what the question is actually about.
The edit was rejected because
This edit does not make the post even a little bit easier to read, easier to find, more accurate or more accessible. Changes are either completely superfluous or actively harm readability.
While I agree that my edit wasn't substantial, I believe that it does make the question more accurate and it does make relevant posts easier to find.
This belief is based on the facts that the algebraic geometry tag specifically says:
This tag should not be used for elementary problems which involve both algebra and geometry.
The other belief is based on the fact that I would never have clicked on this question if it was appropriately tagged.