Design intent has everything to do with it.
No, only actual performance counts, not what some engineer or inventor had in mind when he started to develop the product, while interesting, has no bearing on the actual performance. Design intent is not a performance parameter, only thoughts, concepts, or words, which are not a part of the end product.
Design intent is what the design is supposed to be/do, it is a goal to be attained, but just because somebody designed it doesn't mean it will work as designed. Some intended designs are very good. Some suck. So no, design intent really has nothing to do with it, ASSUMING you actually knew the stipulated design intent by the person designing the bullet. That rarely makes it to the public. People generally ASSUME how a product is marketed (what is written on the box) IS the design intent and that just isn't always the case. Often what is written on the box is what is determined after-the-fact.