If an agent with goal G1 acquires sufficient "philosophical ability", that it concludes that goal G is the right goal to have, that means that it decided that the best way to achieve goal G1 is to pursue goal G. For that to happen, I find it unlikely that goal G is anything other than a clarification of goal G1 in light of some confusion revealed by the "philosophical ability", and I find it extremely unlikely that there is some universal goal G that works for any goal G1.