I can see many people in the comments mentioning various levels of specificity for the tags. I think porn and gore should perhaps have a tag each. Maybe one or two more categories, but having too many would complicate posting on Lemmy a lot. For example, whether or not to put a politics tag may be ambiguous in some cases. I'm not sure about historical artwork, as there are situations where it's normal to be viewing it. There are also some works that I'd rather not be seen looking at in all places: some of that stuff got weird. Not to mention: people marking things NSFW as a joke just confuses things further.
I never noticed it being a big problem though. I think just having one, two , maybe three different tags at most and letting communities play it by ear would work fine.