If i remember yoshi-p said that the relic would become the most powerful wep in the game. Like when Curtana become a Excalibur it be the top item in the game. He also said that they be more upgrade to Excalibur to make sure this legendary sword and the rest of the relics stay the most powerful ingame.

Sure he could end up changing his mind but he should pretty much tell us that now so we don't waste our time if that the case. I'm just going to keep doing it and hope he does not change his mind just to make player base that does not want to do it happy.