Some updates lulz to the story:
Trump had been down on Shine for at least a few months, believing him ineffective and not what he'd hoped for when he hired him, according to people familiar. Shine's role basically became the person who adjusted the lighting and focused the cameras, and he showed no ability to shape a narrative or communications strategy.
Also:
"Trump was very disappointed in him. There's been no improvement in press coverage," the source close to the White House said Friday after the resignation was announced. "Donald would have taken all of those hiccups if he had been getting good press," the source added.