The problem is not his general idea of accomplishing things he promised. The problem is that he really did not understand them when he made the promises. He has no public policy background, other than throwing the occasional fundraiser gala at Mar-a-lago.
He had a hazy idea that health care should be run differently. He felt like he wanted to see change in how we dealt with trade. He knew vaguely that illegal immigration is a problem.
But he did not know about, and really did not care a lot about, the details. He has admitted as much in these recent interviews, acknowledging that he has been surprised at how hard the job is, and how complex some of these issues are.
But that is why he won. The people that voted him are aware only that there are problems. And they, like Trump, complain about them mightily, but then when asked what exactly we are going to do about it, they trail off into the same platitudes that Trump used.
Both Trump, and his supporters, are getting a rude awakening. This job is hard, really hard. What we really need are people that are smart and pay attention to details. Trump's rhetorical style works for getting votes. It just irritates the actual policy wonks who need to figure out how to get us from point A to point B.