Actually, the hair pin of the sword was made years ago, back when all we had was sword, kick, punch, and punch12.
Which was basically when every weapon, including your bare hands, were scripted for sword damage. Hell, some still are because the creators either don't care, or it sells to the NGTCGs better than 'realistic'.
Incidentally the whole realisism argument falls flat when used to argue against a weapon for meter combat. There is zero to do with realism in such situations. Don't beleive me, go get shot in the face by a dozen crossbow quarrels, see how quick you get up. Then, keep repeating the process with a gladius, a katana, a hatchet, a baseball bat, then a dirk until you get my point, or you're finally dead. If you can come back and say you made it through all of that with only a bit of rope burn...well, then I'll concede the realism angle.
Now, thematic compatibility on the other hand is something to discuss. Which is exactly what I'm doing. How is, a big mallet, different from a spear or club? Better yet, how is it more unwieldy than a bow or, a whip? all those, are permitted to panther girls, and some kinds of free women. Finally, why should a big bulky weapon be restricted to the same specifications as something 1/4 its size?
So, if a whip, a far less user friendly device, is okay why not the hammer? Obviously someone who runs around with a sledge 24/7 is missing the point, but the occasional use or even ownership of such a tool is not nesecarilly unfeasible. . Heavy yes, but not out of the realm of possibility.
As for damage. How are two people with identical meters and weapons doing different amounts of damage?
Final question, does anyone here have an issue with a man using this? Since that's obviously the primary target audience, not the female demographic under discussion here.
I am an opionated artist, not a typist or english professor. So, excuse my typos and the occasional mispelling. Also yes, sometimes I will say weird things you need to google to figure out.