Except that's an intrinsically silly thing to say. SLS's main advantage over Starship is that it's just the latest in a design history going back to the 80s, and many different permutations of various configurations of SLS's stock components have successfully flown.
To suggest there's no evidence that SLS will fly is therefore silly. Your "small number of major components" include the engines, the fuel tanks and plumbing, the boosters, the aerodynamics, the reaction control, the flight control and all the parts to link them together. The parts that deliver the payload. The parts that make the rocket that takes your stuff to space.
(, Sat 14 Nov 2020, 14:10, Reply)