>>108327549To be fair, Momo's quirk is INCREDIBLY hard to use.
Not only do you have the conservation of mass problem, but you have to understand EXACTLY how something works, down to the smallest possible piece, in order to make it.
She effectively has to have an engineering degree and be able to build a functioning device in her mind purely from memory before she can even worry about whether she can use her quirk to fabricate it.
She doesn't just press a button and magically get the item for free. The level of effort involved in making anything more complex than a solid shape like a pole or a shield is tremendous. The fact that she can make things like tracking devices, flash bangs, or gas masks is already really goddamn impressive. You can't expect her to be able to make everything on the spot like that.
