I agree with skylightcrystal and 忍猫 that parted_bangs is causing images without bangs to be tagged with bangs, and I've long been in favor of a tag for no-bangs hair because so many uploaders don't tag bangs (see -bangs; I've been using no_bangs, which ought to be moved to parted_hair now).
I support the use of a new tag rather than the removal of the parted_bangs->bangs implication because its tag name invites the "x_bangs, so it's a kind of bangs" logic that led to the implication in the first place (topic #6180) and because I don't think it's a fitting name for hairstyles that don't have the actual short part, or where the short part isn't visible because it's parted so well or because of artist abbreviation.
parted_bangs would be a good tag for post #3604802, but if uploaders are already used to using it for non-bangs posts, I would support getting rid of it (and using parted_hair + bangs) in order to stop watering down the bangs tag. It's 36000 posts, though, which is more than anyone is going to be able to clean.