Think of it this way, if Donald Trump’s real goal is the Bannonite strategy of burning down the house in order to rebuild it in his image later, then who benefits most from passing tax reform? The truth is that mainstream conservatives and establishment Republicans like this supply-side tax bill that cuts corporate taxes much more than nationalists do.
If Congress functions correctly, the establishment wins. It means that governing is actually possible. It means that incumbent senators can run for reelection claiming they actually did something. Conversely, congressional dysfunction actually proves the Bannonite point about liberal democracy being impotent. So maybe Trump is doing this on purpose?