What's a load of crap?

The margin of error suggestion is a load of crap as who decides the margin and how precise is the margin going to be once the margin limit is reached? What happens when fans argue just as much when the players are further apart? If you think that is the answer then it's not as the answer it to go back to the linesman and everyone just accepts it's impossible for a linesman to call offside correctly.
Read my post again, there are less offsides this season as in the linesman isn't flagging as much as they normally would as they're holding back. It's got fuck all to do with VAR, it's the new 'let play continue' rule or have you not seen this in action? That means play is allowed to continue and goals are sometimes being scored but then ruled out due to being offside by a mm. Last season the lineman may have flagged and stopped play before the ball got anywhere near the goal and I gave the Shelvey goal as an example.
I accept this VAR offside method is certainly not precise but it's the best they can do with the tech they have yet you're blabbing on about calibration certificates/GPS. They might as well do away with the real thing and just use virtual reality and have the players play of FIFA20 if you want to be that precise
VAR first select the frame they think the ball is 1st touched using multiple view cameras. It won't be the exact moment but it will be the first they think it's touched. VAR then selects both players positions across the pitch and also selects the point of the body they think is the nearest to the goal to make the various lines. It's still guesswork but it's as close to the answer as you'd get with what they have.
You're talking of adding a margin of error, so how do you think it should work? There is actually quite a large margin of error if you look at how fast players can run. (you're a mathematician aren't you?)
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That links reckons Gareth Bale ran as 22.9mph so he travels just over 10 metres per second. Over 30 video frames per second that means he's moving 33cm per frame. A defender who can run like Bale running directly the opposite way is also going 33cm per frame. So that's a crossover of 66cm per frame of video. Realistically for attackers/defenders running as fast as they normally do, I'd say most extreme situations would be closer to 50cm as not all attackers/defenders will run at 23mph directly against each other. 2 players both moving at just 10mph will move 30cm between a 30FPS frame of video.
So there's no denying there's still some distance that can't be covered by VAR with this freeze frame thing. I've just shown that theoretically it could be over 60cm (2 feet) so should something this big be the margin of error? What if players are standing still such as a free kick, do you still allow the margin of error that was calculated using the speed of players?
It can't happen as it would be open to interpretation and that is a problem that has been around for years. See below as to why I think you can't have a margin of error or have the officials call for a review.
If managers and players are moaning about it now then they'll moan even more (and fans) when it's left to the onfield officials to decide if it's too close and call for VAR but they don't and the player is 1 yard onside. Those 2 you say this weekend would then be reviewed anyway so they ref would call for them to be reviewed so surely it would still cause the same moaning and arguments?
The problem some aren't grasping is that when does it become obvious? If you say things like "you can see daylight between them", "if you can't tell in 1 quick replay" etc etc then people will still be pissed off about the decision. That's because it has happened for years since TV replays started as people still see things differently. The one freeze frame and shitty click a pixel on a player's armpit is about as precise as you're going to get. All of the suggestions so far simply open up a larger field of opinion and therefore an bigger debate and bigger controversial decisions when a winning goal is disallowed yet the player was actually onside if they'd use the freeze frame/click a pixel method.
What is obvious though? Who decides and do you honestly think that managers, players and fans will agree with all the reviewed decisions? It will be like going back to the days of linesman making the call but it will be even worse as someone will actually review it and possibly still go against what some will think the decision should be. There will be even more uproar when something isn't reviewed or is/isn't corrected when most see it the opposite way. At least previously the linesman had an 'excuse' as he's got 1 unique view in real time that everyone accepts is impossible to get correct and the linesman sometimes makes assumptions based of their experience of running the line.
I think they should just do away with it as no matter what they do to get the correct decisions won't please everyone. We should all just accept humans make mistakes (though obviously some will think it's also biased decisions).
That's my final and brief post of the year

all the best lads n lasses and enjoy the New Year!