Im not sure you actually achieve any of this with the SLS, and NASA in general. 1 and 2 are irrelevant if the cost is too high for anything that isnt a political stunt, to be a real alternative it needs to be something that a commercial payload might plausibly choose.
3 and 4, are compromised by the political nature of NASA spending, I dont believe the current institution is capable of innovation. The talent of the people is uncertain, not due to the individuals, but the way work can become visible (also the hiring, promotion, and leadership determination is based on politics not merit) Apart from long range experiments, nasa is really the cutting edge at the moment.
5 is just another way tax money evaporates.