[Fjolsvith]

You are only seeing half of Trump's hand by looking at Twitter. Trump has a front channel which is Twitter (et. al.) and a back channel which you nor I am privy to. He uses both of these to achieve results.

Also, assuming that Trump doesn't utilize advisers seems to be willful ignorance. Trump studies a topic in depth before making a decision, and he very much listens to experts in that study.