Thoughts on Trade Goods

I don't know if there is another thread that has discussed this, but I wanted to get people's opinion on trade goods and relations (or lack there of) to trade routes.  I love many aspects of Gal Civ but the only thing that has bothered me is how trade goods are more like patent licenses than actual goods for trade.  Unless I am mistaken, they are really little more than additional technologies tied to unique buildings that can be traded once to the other races with no lasting benefit to the creating race.  Worse yet, it seems as if the race that is recieving the trade good, continues to recieve the goods even after they have declared war on the supplying race or have no active trade routes connecting them.  Ideally I would think that have control of unique trade goods would passively increase the amount recieved by the creating race's trade routes (say +1-2 bc per good per route) after a deal has been brokered between the races.  And should the trade routes be severed or war be declared, that the recieptant loses the specific bonuses.  What are your thoughts?