Why would a Hard Mode primal drop an i95 weapon when the current extremes drop i90? That would mean that leviathan hard mode, a story mission, would be as hard as t5 or at the very least be harder than the current extremes. I doubt levi hm is as hard as t5 or current extremes. It makes more sense for levi ex to drop i95, giving you alternative to t5 weap, and then require some item or collection of items to upgrade it to 100.
Not to mention that all of a sudden youd be giving newer players going through story an i95 weapon b4 they even touch an extreme or 1st tier of coil. Just makes no sense.
