Starship is irrelevant. SLS was dumb already in 2011 when Starship doesn't exist. Its a dumb system and was never the right system. NASA own analysis showed that.

People who defend SLS on the bases that Starship isn't good don't get it. It doesn't matter if Starship exists. SLS should have been canceled even if you assume the state of the rocket industry in 2015.

Anybody with half a brain and 3h time to do analysis on the topic could figure this out.