This is different than 'single issue voting' -- The voter is reducing the Office of the President to a single issue without awareness of the interconnectivity of the micro-issue to the macro-issues as it is held by the "Office of the President". And in this instance, the person in the Office has a"business" model superimposed over the Office of President. He issues a one page talking points description on Tax Reform with the corporate expectation that someone down the org chart will flesh it out for the CEO. 
The business/corporate model of Office of President, allows for industrial growth - only. Selling weapons without awareness of their use. Removing environmental protections to build more industry. Dismantling agreements to facilitate industrial sales.  There is no long vision required, The Office of President is for this president, head of a multinational corporation and he has only staffed a "board of directors" of which he is president. 

His diminished POTUS  = a celebrity CEO.