It was disappointing that Fernandez hitting the AR was not sanctioned. A number of parks referees will get thumped next weekend and you can draw a direct causal relationship between these events.
In addition, the number of occasions when players of both sides (well all professional sides actually) have feigned injury in order to get an opponent into trouble is on the rise. In this game, a Manchester United player attempted to do this after about 75 minutes when they were (only) 4-0 down. Lets imagine that - in a parallel universe - this attempt at deception was successful (both with the referee and VAR) and the Liverpool player was red carded. It is highly unlikely that this act of deception would have changed the result, so why do it? Its now the "leaned" response of a player to respond to any physical contact - however minimal - in this theatrical way.
If successfully deceiving a match official is punishable with a two-match ban, surely an unsuccessful attempt should attract the same sanction? Or are we saying that while murder is a crime, attempted murder is not?
A couple of hours a week reviewing the weekend's games followed by two-match bans for the "feigners" would have this problem solved in six weeks. But we know that it is not going to happen, because of the powers-that-be wanted that they would have empowered the match officials to deal with it. And they have clearly done pretty much 100% the opposite.