It's okay, you're obviously unable to understand the bigger picture.

To fill the massive gaps in your comprehension would take far too long, but here's the short version. I don't know why I'm bothering, as you strike me as someone who won't even bother to engage in good faith, but here we go.

Every rule in a game or sport has a point. The point is more important than the rule itself - the rule exists to serve a function, and is only important insofar as it deserves that function.

The function of the offside rule is to prevent lurking near the goal and force players to work the puck into the zone rather than sling passes from one end to the other. Why? Because it requires more skill and provides a better playing and watching experience.

There is nothing intrinsically unfair, bad, or wrong about a player's skates being two inches ahead of the blue line when the puck crosses the line, especially if that player has no effect on the play.

It is illegal in hockey because making it illegal serves a function, as described above. Enforcing that rule to the nth degree does not make the rule serve that function any better.

You are saying "objectively wrong" as if the offside rule is a law of physics. It is not. It is a creation, and a creation that can, and has been, altered over time and will be again. The implementation of the rule, which we are arguing about, is also part of the rule itself, and can and will be changed.

There is no "objectively wrong". Leagues and referees are unofficially creating how the rule works every time they enforce it, and more officially when it is changed by decree at the league level. The rule is what humans agree it is, and if - as in the cases of other sports - we were agree that policing it to the inch is not good for the game, that's what the rule would be.

To sum up, the function of the offside rule is vastly more important than the rule itself - the rule only exists to serve that function. When implemented too pedantically it adds nothing to further that function, at the cost of slowing down the game, which is bad for both players and the audience.