Except that by and large, the call is easy to make. Again, the number of challenges vs the number of occurrences is minuscule in the grand scheme.
You are wrong on the "an inch here or there simply doesn't matter". It does matter. From the most basic fundamental structure of the game aspect, it matters. An inch, okay. What about two? Three? Four? A foot? When EXACTLY does it matter? Literally, name the distance. How far can a player violate a rule before it should be called? How much is too much? So you call the 6 inches offsides. Then you let the 1ft one go and a goal is scored. Is that fair to either team to have an undefined rule when looking for the utmost consistency and quality of the game at the professional level?
I go back to the goal line question. The rule states the puck must completely cross the goal line. Game 7 OT SCF - Oilers vs Canes rematch. McDavid puts the puck past the Canes goalie and it goes over the line 90% of the way. The refs say, "Well, geez, it's close, plus the fans might get mad if we review it because this is an intense game. Good goal, Oilers win". You're going to sit here and tell that is good for the league, that the inch doesn't matter, and that you have no issue with that? Please.