Uhn... I don't get your point? I mean...
- Cross-dressing is a very specific tag. Hence why it exists.
- Male to Female and Female to Male are absolute necessities to make gender bender work, so they have to exist by default in order to have the genre.
- Trap is a very common anime trope that most people can easily identify... It is enough to be a tag, though one could argue for its removal.
- Transgender is a very specific tag that has a big community that cherishes it in Scribblehub. Hence why it exists.
- Futanari is a fetish tag for R-18 stuff. There are tons of those and they help people that wanna find erotic stuff that suits their tastes, nothing strange about this one.
- Multiple Bodies, Reincarnation and Transmigration by themselves have nothing to do with Gender Bender OTOH. They can just be used to better characterize a story that happens to be Gender Bender, since those are usually the most common causes for the gender bending.
To me all of those tags have a very clear reason for existing, which is why no one asks for their removal. They help you characterize your story and make people know what they're getting into before they start reading.
You can suggest tags for Fantasy if you want, I don't think anyone is against that, but I don't see why you are complaining about the tags I mentioned, they all seem extremely relevant to me.
Also... What is a "hard" magic system? How does one classify what is a hard and a soft system in the first place? This seems really vague and doesn't seem to be very useful as a tag.
And what makes a Fantasy "epic"? What about it is particularly different from other types of fantasy stories? It also seems really vague and not very useful.
Moreover...
- There are 10 tags with the word "Magic" on it.
- There are 3 tags with the word "Weapon" on it.
- There are 14 tags with the word "World" on it.
- There are 5 tags with the word "Ability" on it.
- There are 5 tags with the word "Beast" on it.
- There are 4 tags with the word "Monster" on it.
- There are 6 tags with the word "Power" on it.
- There are 28 tags that revolve around some sort of Fantasy Monster, going from the classic Dragons to niche things like Shikigamis.
... Do you really think there isn't enough to describe a Fantasy Setting? I mean... Just what exactly do you want to write that you can't find the tags for it? I don't get it.
Gender Bender has nothing to do with erotica by itself. It can be used as a fetish, but the same can be said by pretty much everything, so that's besides the point.
Gender Bender is usually used as either a tool for comedy by putting a protagonist in a position they aren't used to due to the gender change, or by making some more serious dives into human psychology as the character enters a conflict within the gender they had always identified with throughout their life, and the sex of their current body... As well as having troubles and confusion regarding what gender they prefer now that their own gender changed, since a change in the body may also influence the way the head sees the opposite gender.
That's the kind of thing you usually see treated in gender bender... Seems like you never tried reading one if you think it's about erotica... >.>