I've encountered a lot of posts -- and I mean a lot -- where certain tags are added purely based on content in the description of the image, not due to anything in the image itself. I'm sure many taggers have similar experiences. This is against TWYS policy, but it shows that a lot of users believe the information from descriptions is important. It's also worth noting that a lot of these mistags are for popular tropes that are common in stories but hard to show purely visually, such as enemies_to_lovers, forbidden_relationship, and virginity. On the flipside, there is also the issue that descriptions can contain triggering content that users may want to blacklist -- and it's entirely possible for Safe-rated images to be accompanied by pornographic stories, which is, I think, a problem.
Currently, the only tags that can relate to the description are lore and meta tags, but those are very limited. I wonder if it would be a good idea to have a separate tag section just for tagging descriptions?