I'll respond with my approach. I play for immersion (yeah that word). I like to forget I am playing and become the character. Using mechanics for things I personally cannot do doesn't hurt that, as it is me rolling dice to simulate an action in fiction. But when I am inside my character, mechanics that influence decision or push for certain actions completely pulls me out, as I am not thinking as the character, but as a player on how to maximize the mechanics.
Roleplaying isn't "it's own reward" for me - it's the entire reason I am in the hobby- so mechanical input on how I play is, in fact, an impediment to why I play.