Forget the match, the rivals, everything and just focus on the rule.
Why it's so bad to revisited the rule?
The main aim of most of the rules it's to avoid a player take advantage of a situation in a deliberated and unfair way.
It's true that the deliberated part in some situations it's hard to apply, yet as hard as it is, in other cases it's still done, like in some hands in the area that look mostly unintentional (we never trully know) are still not called, controversy will arise, yet at least the decision it's in the spirit of be fair and even avoid very skilled players to aim for hands in the area.
In this rule the thing to revisited it's that if a keeper crosses his line and saves it, it's retaken, sthg similar should be applied to players shooting. And BTW I would not either like a to call it a goal if the keeper crosses his line either, that's too much, even if it's way more possible he did it in a deliberated way, like in most cases is.
There is no player in the world that deliberated would slip to try to score, even if someone would like to try some trick in such fashion and try to desguise it as a slip, the risk it's too much to even try it, we all know this.
So there the deliberated part it's practically impossible. That opens the door to create a more fair rule.
Why should be nulify if he ends scoring? it should be part of the game where luck, timing it's involve, even if the trajectory it's massivly affected. Way less fair would be to nulify a goal when the touch it's so minimal that doesn't even affect the trajectory and it's really hard to spot it.
The same thing would be if the player slips and he doesn't score, bad luck man, it won't be retaken, shyte happens.
Now if someone raises the ball to make a volley, something really obvious, feck you lad, that shit it's a no no.
What I'm saying it's that I get that trying to leave subjectivity aside it's one of the aims, yet to also think in terms of it's really a play where the player in question it's trying to take an advantage shoudl be too, it's still also very important and the main reason behind any rule in the sport.
PD: I hate the mm. offsides too, mainly because there is clearly no real advantage in such actions. Yet I absolutely understand in this case that they try to avoid controversies, still in many cases it's going against the spirit of avoiding a real advantage. If the tech allows it, I would have no problem to deteminate a certain distance and from such distance to consider even 1 mm to be offside, yes it will create controversies too, but at least it would be more clear that the lad in question it's trully offised gaining an advantage. Of course I believe that it's really hard in this case and that many people will preffer to be extremely taxative.