bending the knuckles is one of several solutions for specific issues, bending the hinge pins is specifically done to keep the door from swinging freely (just in case the wall happens to be leaning enough that the doors own weight would move it). Bending the knuckles slightly adjusts the swing and orientation of the door.
I don’t bend the hinge pins, I bend the hinge “knuckles”. That’s probably what you meant.
bending the knuckles is one of several solutions for specific issues, bending the hinge pins is specifically done to keep the door from swinging freely (just in case the wall happens to be leaning enough that the doors own weight would move it). Bending the knuckles slightly adjusts the swing and orientation of the door.