Your extension doesn't make any sense. I'll try this again.
The offside rule was introduced to prevent the clear advantage caused by an attacker 'goal hanging'. That advantage is not gained when an attacker is 0.1 mm ahead. When is that advantage gained? It wouldn't hurt for there to be consensus on when a significant advantage is gained, and have the VAR use that point as the trigger for determining offside.
You saying "there will always be ambiguity so let's set the point at zero" makes no sense.