VAR will never replace match officials. Never ever ever.
It looks so far as if there is some hypersensitivity that officials have when it comes to overruling the match referee in the Premier League. The "clear and obvious" thing is a problem. I certainly seem to have a different interpretation of what's clear and obvious than the officials because we've seen lots of decisions not overturned which looked pretty clear and obviously wrong to me.
This is an overriding issue with referees that completely outdates VAR. "The referee's word is final". Why? Referees are not robots, they are human beings, and there's nothing wrong with admitting a mistake. The 22 players around them make mistakes while millions watch on all the time and have to embrace it and move on. I understand that abuse of officials is a big issue in this country from grass roots to Premier League, but it doesn't help to put referees in this glass cage because it makes them come off as above reproach and maybe even arrogant through no fault of their own.
In rugby the referees wear microphones so that the crowd can hear them explain decisions. In tennis you have umpires and line judges who get overruled by Hawkeye all the time, they dont burst into flames and they certainly haven't found themselves out of a job because of technology, and that's in a sport where you could quite easily get rid of all line judges and set Hawkeye up to just set a small alarm off every time a ball lands outside the court like the referee's watch for goal line technology. Football is a sport of a million grey areas so I can't see in any way how VAR should be a threat to referees.
The implementation in the Premier League has indeed been controversial at best so far. However, the technology is not the problem, it simply can't be. The next step seems to be to change the clear and obvious thing. Their other problem is trying to use VAR to make black and white decisions, like with the handball rule that caught City out against Spurs. Football will never be black and white and trying to make it so is a waste of VAR. Judgement calls will always be necessary, and VAR should only be used to get a closer look from different angles if necessary. They also need to be braver about overruling the match officials in the stadium. Unless there's a massive ego culture amongst top referees that I'm not aware of, I can't imagine a referee being too upset about someone with a load of extra camera angles making a "better" decision than them. I don't imagine someone pig-headed enough to get annoyed or insecure that someone with more resources than them is overruling their split second decision has the self-awareness of professionalism to end up anywhere near refereeing a top flight match in the first place.
Those are my key takeaways from what is still only four weekends into this huge change to the sport.