Tillerson’s mistake was to essentially WILLINGLY adopt the agendas presented to him by the Deep State globalists which make up the great bulk of State Department bureaucrats. He did that even where the Deep State agendas were hostile to the vision of President Trump. Tillerson wasted a year of his life and he will not be missed.
Tillerson proclaimed himself and was know as a supporter of the Council on Foreign Relations views that are Holy Writ in the State Department. Seems like the President felt he couldn’t go far beyond the usual CFR/Goldman-Sachs crowd.