You see that pointed tip? Halberds are meant to stab as much as chop. I’m not gonna get into the specifics of weapon usage here, but just pointing that out.
You’re overlooking the myriad of different weapon types already present in various weapon categories. For example, just in the one-handed sword category:
- Cinquedea
- Sabre
- Shamshir
- Scimitar
- Falchion
- Gladius
- Kris
- Spatha
These weapons all have different origins and are used differently, but are categorized as the same in-game because they’re all one-handed swords. They all use the same animations and are otherwise functionally identical. Of course a nodachi isn’t used the same way a flamberge is, but the distinction isn’t made in the game or by the devs.
I don’t think spears should be a magical exception to this. A naginata or halberd could easily fit into the two-handed spear category without much a problem. Unless there’s a class that focuses on a very specific kind of weapon, I don’t think these should be unique weapon classes.
@thebloodyaugust also makes some good points regarding damage types, which I also expressed in my previous post.