I'm pretty apathetic towards this myself, however-I keep seeing the notion that it's normal or makes sense that a weapon made from your soul (which, I believe it's been said in anotehr thread, is not actually what's being used fyi) should only be usable by you.
How do you figure? Cause I mean, we're talking about something that is just not possible and has no bearing to the real world. To say that it only makes sense or it's normal or whatever just... no. Don't. I don't mind that being the case, but I don't think trying to make that argument is at all logical and should not be used to justify it.