This is exactly the case.The problem with offside is VAR.
The rule is to stop goal hanging first and foremost and is by nature somewhat subjective. 'Is the attacker gaining an advantage by being beyond the last defender?' This is a subjective view of the official with the flag and ostensibly comes down to 'do I reckon, to all intents and purposes, that he's level or behind the defender?' If yes, onside, if no offside, benefit of the doubt to the attacker.
VAR has taken something seemingly objective but intrinsically subjective, and made it categorically objective down to the millimetres of toes and armpits thus creating the stupidity we have now of players being deemed offside despite very clearly not gaining any advantage over the defender. The powers that be want offside to be objective, but deep down it was never meant to work the way it's now treated in the modern game because it couldn't. Now that it can I think most agree that it shouldn't. Sadly, that doesn't include the powers that be.
A system which can subjectively say that Milenkovic was offside for that goal against Southampton, also wants to objectively say that the ball joint of the attacker's shoulder was goal-side of the defender's kneecap - it's an absolute nonesense.
The insurmountible problem with forensic offside decisions, however, is NOT "which part of the attacker do we judge, and which part of the defender?"
It DOESN'T MATTER which parts of which player is used to make the decision.
The problem, regardless of bodyparts, daylight gaps etc will ALWAYS be the edge cases.
The cases of overlap.
The cases where there _might_ be daylight between the attacker's shin and the defender's boot (and you can guarantee that the variable clouds at Old Trafford and Anfield will produce or shroud "daylight" when circumstances require.
The cases where the inherent inaccuracy of Semi-Automated Offside (because, believe it or not, people, it's inaccurate. It's good, it's better than the existing stupid lines nonesense that Stockley Park produced, but in EVERY system there is a plus-or-minus.)
In a semi-sutomated offside decision the inaccuracy is small, maybe 2-3 centimeters....Welcome to the edge case where the attacker's knee is apparently 2-3 centimeters beyond the defender's elbow , in a system with 2-3 centimeters of absolute uncertainty.
If you are going to use forensic-style analysis, you will ALWAYS have edge cases.
There is no way round that.
It's the edge cases that we're angered by now.
It will be the edge cases that we're arguing about in 10 years' time.
The only way to reduce the number of edge cases is to reduce the number of times the system is employed.
The solution is to check only when a coach/manager uses one of his quantity-limited challenges (rather like in tennis, cricket).
VAR in and of itself isn't the problem. The problem is the completely botched and incompetent implementation of VAR, compounded by the absolute muppets operating it.