No, I understand you.
The thing is, an enchanted item would work as a weapon:x for 1 attack and then vanish, mechanically. If you wanted to draw it out of the book to fight with for an entire scene, that's where modular abilities comes into play. By tying it to the item of power, you make it an item, not a character power.
I never read the books, so it might really not fit, and if that's the case, ignore me. But I think the power is pretty neat to model something like that. I have a character in my campaign who has a bag of magic items that he can draw from, each with a different power. The character itself does not have a single power, he can use the items which store the powers. Mechanically that makes no difference, but narratively, it can be a huge deal.