Originally Posted by andr0id

In practical terms, you are correct. You adjust your saddle to the point you don't slide forward. Not a degree more or less.

Hip angle useless if a rider is constantly fighting to maintain a correct saddle position.

Very few riders tilt a saddle too far back, far more tilt it too far forward and are often not even aware they slide forward as they subconsciously adjust position or push back on the handlebars.