Now that we have the top-level tags marvel and dc for questions about any Marvel or DC properties, there's been some chat about whether we need certain subtags. Obviously it's worth having subtags for individual films or TV series within the overarching Marvel/DC universes, but we don't have tags specifically for comics-based Marvel/DC questions: marvel-comics and dc-comics are synonyms of marvel and dc respectively, as discussed here, and comic-specific questions can be tagged with comics as well if necessary. But what about tags specifically for movies?
I've been told that the marvel-cinematic-universe tag is worth keeping, since it's not just the same as marvel+movie. I've also been told that the dc-movies tag is not worth keeping. If this is the case, I can easily merge it into dc, thus removing it from all questions (and ensuring they're all tagged appropriately with the DC tag) without any manual edits required. But given my utter ignorance of all things Marvel and DC, I want to be absolutely sure that this is the right thing to do.