The referee's job, especially at elite level, is nigh on impossible, virtually every player cheats in some way, whether it be diving, exaggerating contact, time-wasting, disputing decisions, pushing, pulling shirts and everything else that goes on
And then there's the microscopic examination by ex-player pundits and fans, most of whom don't understand half the rules themselves
I don't think standards have actually dropped, VAR is just highlighting stuff that used to be missed, VAR is also responsible for referee's passing the buck sometimes and because it exists the decisions have been inconsistent
IMO, if refereeing is to improve, then the players and managers need to take a long hard look at themselves, cut out the cheating and the referee's job becomes easier and their decision making will become better