The problem with football refereeing is that it is inherently a game of subjective decisions. Even decisions which should in theory be factual - is someone offside, did they handle the ball - are coated in layers of subjectivity.
The response of the authorities (and let's be honest, many supporters as far as VAR is concerned - if you were one of the few against VAR when it was being discussed I doff my cap to you) has been to introduce new layers of subjectivity. There are now three: on-field referee, VAR, KMIP: the latter two frequently over-ruling previous decisions because, well, that is what happens with subjective decision-making.
None of them give definitive decisions that are accepted as final judgements because interpretations differ and/or rules and interpretations (the naive "letter of the law" argument) can't possibly address all potential scenarios. Dale fucking Johnson can wank himself silly over the decisions of the KMIP but they are just as prone to error as the on-field decisions and, at the end of the day, are led by referee interpretations (I don't even talk about the uselessness of VAR).
To cut a long rant short - simplify the laws of the game, replace "interpretations" with training of referees on taking factors into account and performance reviews to improve performance (I assume that happens but it's hard to tell atm), and use retrospective punishment for any cases where players are trying to "get one over the referee" - diving, hidden offences, unsportsmanlike conduct, swearing at / intimidating the referee.
Oh, and get rid of Webb the same time the PL gets rid of Masters - they are both useless cunts.