Phil plays hard, and I think he's light years ahead of Felix at this point in terms of knowing his responsibilities on the court, both offensively and defensively.
Could Amir pull away a few of his minutes? Yea. I agree that might not be a bad idea, especially against bigger teams.
But otherwise, Phil is our best option coming off the bench to play in the backcourt.
And again, for all his faults.. I've never seen Phil dog it. Since his first game last year against Post, or whoever, he has always played hard.