Short answer: Phil is lazy. Long answer? Steven of The Dead brought up a good point. He said "(Phil) finds a playstyle he's comfortable with and he sticks with that playstyle, no matter if the game encourages experimentation, or how frustrating it is to his audience. He will grind out that playstyle until the end. He lacks any form of intellectual curiosity and is afraid to experiment."
There's PRIME examples, but the best example is Devil May Cry 1 - where the game ENCOURGES the player to try spells, combos, etc...what does Philly boy do? He finds ONE playstyle he's comfortable with, turning a game that has HIGH combos, spells, and encourages the player to experiment, to a third person shooter. Most players would adapt to different play styles and try something new, however, Phil finds ONE style he's comfortable with, sticks to that ONE style and rides that wave until the game is over.
He likes comfort and the familiar. When a game throws a challenge that REQUIRES the person to use a different playstyle, he FORCES that one playstyle he's comfortable with usually with brute force until he wins or wagequits.
Not just in games, but also in life and how he runs his business. Phil HATES change and he HATES trying new things. Even if he's FORCED to try something different, he wants to go back to how it USED to work. Again, there's TONS of examples of that and we can be here until the next century pulling example after example, but hopefully this is an adequate answer.