If you're going to start measuring the actual offside so precisely, then you have to measure all aspects of the situation in the same way.
As heart-breaking as that decision was for Coventry, if it was the correct decision (he's off or he's not) then what needs changing?
The only 'change' that I can see is whether you employ VAR at all or not.
nt
Speaking of tedious...here's Mazzzzzzz