[Freddy]

Another dynamic may be going on that might deserve mention.
Think of officiating a game as three partially overlapping bubbles representing what your mind needs to concentrate on. One bubble represents RULES, another MECHANICS/SIGNALS, another JUDGMENT. Ideally, one wants to know the rules so well and his/her mechanics (including positioning and primary coverage areas) and signals so well that hardly any thought at all needs to be expended during a game on those two items. That means you can invest all your mind's efforts on judgment, whether and when to make a call or leave it a no call, which is the situation you originally cited.
With more and more games and situations and camps and contests observed under your belt, you'll find yourself migrating over to that judgment bubble more and more over time.
Make sense? Or just a bunch of psuedo-neophilosophical psychobabble?