The SLS is not about space. It's been referred to as the Senate Launch System for years now and that's very accurate. It started back in 2010 and still isn't going up anytime soon. For comparison the first time we sent anything into orbit (a probe) was 1958. The first time we put a man in orbit was 1961. In 1962 Kennedy would give his famous space speech. In 1968 we sent a man around the moon. In 1969 we put a man on the moon. Compare the timelines and it's simply pathetic.
But what the SLS does provide is an immense number of jobs, votes, and support for the congressmen that keep it funded.
The last chief of NASA, Charles Bolden, was the person you want on paper. A decorated and high ranking military officer who was an astronaut with a STEM education. What he was not was a political player, and I think NASA has suffered under him. The person that has replaced him is, at a glance, is the exact opposite of who you want. Jim Bridenstine is an MBA, career politician, and has no technical background whatsoever. But he does have a genuine interest in space which he has worked to support for years, and he is, for better or for worse, a political player.
And I have hopes and expectations that he will change the direction of NASA into the far more logical direction that you, and just about everybody, sees would be more productive. And I think we're already seeing this. Recently NASA released a scathing report against the SLS which said, without mincing many words, that they're not going anywhere anytime soon if they have to rely on the SLS. The lengthy report is here [1], here [2] is a random media report on it to give some sort of cliff notes. This is the sort of stuff that Bolden, for whatever reason, did not have the capability or will to push through. That report didn't say anything that everybody didn't already know, but actually stating those things was speaking what must not be spoken - and is now something that demands action.
[1] - https://oig.nasa.gov/docs/IG-19-001.pdf
[2] - https://www.extremetech.com/extreme/278656-nasa-report-blame...