The reservoir of refs is rather shallow, and PiGMOL will necessarily have to take whatever 'quality' comes along. There is also the false notion that 'young' referees can be fast-tracked into the PL - Attwood being the best example, followed by the clown Jones.
They hide behind the cards in every match. A player, de Bruyne, questions a decision and the card is out! Their performances are mediocre at best, and they are being well-paid for average and less than average application.
The top and bottom of it is that they are attempting to perform an impossible task. We know that Aguero was fouled in the penalty area and the ref was too far away, decided beforehand that only catching the ball would deliver a penalty, or he wanted decent headlines the following morning. The game is too quick for them, no matter whether they have 20-20 vision. We had a match last night the result of which didn't reflect what happened on the pitch, and the 'visionaries' governing the game are more than happy with that state of affairs.
We also have to contend with intellectually-challenged pundits writing and re-writing the Laws of the Game to include such gems as 'foot on the ball', 'there was contact', 'he's not that kind of player', and other snippets of bullshine that do nothing but cloud the issue.
I can't see the situation improving in my lifetime! (Have I heard that last bit before?)
