Not sure if I understand whats happening here.
So you now have the option to upgrade your exotics - BUT - is it the same cost and end result if you pay to upgrade a brand new exotic as it is to upgrade a fully perked out exotic of the same model? If so, that's insane. If not, I don't see the issue.
what do you mean? basically you would need 2 Exotic Shards to upgrade Hawkmoon to 330, but exotic DLC items like Dragon's Breath would only need 1 (because it is a DLC, not old stuff)