Yeah, the reason I do it is to really push the expression on the character's face and make it really prominent. I find it the most satisfying way personally when I make the grin really wide instead of just a usual tiny grin that the show usually has.

Certain expressions are definitely harder to deliver well when sticking to the show's standard design philosophy which is why certain angles on ponies are used more often in the show and a lot of Pinkie expressions are used sparingly or only once. Essentially, I also do it so I'm not just restricted to copying the show and making my own depictions of how a character would show emotion.