While I agree that refereeing is awful at times and they make a lot of errors even with the VAR and goal-line technology, I still think fans can never be satisfied. No matter the decision of the referee, especially in very controversial situations, there will be a portion of fans that will say it's a robbery if the decision doesn't go their way. If the decision favours them they'll say it was the right decision.
Let's take the Barcelona game on Saturday for example. Athletic Club were given a penalty and Barcelona fans felt they had been robbed. The on-field decision by the referee was no foul, but VAR called him back and asked him to review it, he reviewed it and gave the Barcelona player a yellow card and awarded a penalty for Athletic Club.
Now if I'm to judge that case, I'll say it's a clear penalty, but not a yellow card because the Barcelona defender slipped and fell on the leg of the Bilbao player. He roughed him and prevented him from scoring, but he didn't do it intentionally because he slipped so it shouldn't be a yellow card.
I know that the technologies have not been perfect, but in my opinion, it has made football fairer than it used to be. Before the bigger teams have so much more favour than the smaller teams in a match, but today it it no longer that much.