As blacksmithing serves no purpose in this story but to insert a girl as a plot device [...]
I dunno, optimistically, it seems like it might be leaning somewhere thematic with it? Like, their relationship isn't just "weak" or "shallow", it's downright abusive. She wants people to use and appreciate her weapons; he's the literally the only one that even wants to use them, but he shows little appreciation for them and no hint of any desire to stop breaking them.
He seems to wants someone to hand him weapons, but doesn't really want to take care of the person who's handing them to him, frequently indicating he's not all
that fussed to let the denizens of the local hellscape do whatever they will to her. Everything about their relationship seems fundamentally unhealthy.
What I can't tell is if it's heading towards anything weighty and significant with all that, or a horror sequence, or whether we're homing in on some trite shounen-jump style theme about making and breaking weapons that's just another excuse for action scenes, along with passive or superficial reconciliation... It really feels like it has the capacity to go several ways.
Yea, I did find it super weird how the weapons just break apart like styrofoam. Also no one needs weapons literally at all? She establishes that magic is exhausting to use.
I can find it believable that no one around her
needs them—I mean, heck, we don't have much any need swords in our modern lives for broadly similar reasons of them being literally ancient history as weapon technologies go, and the fact that guns can run out of bullets doesn't really change the equation—but, I can't countenance that no one
wants them. Where the hell are the Mall Ninja customers, yo?