The massive thing that was overlooked with VAR, by me included, is the huge human failing that leads to refs simply not blowing or punishing and hoping VAR bails them out. We see it every week now, the most striking one being the blatant Kovacic red. Oliver bottled it, and then a video can be watched over and over and justified any way they see fit. Had Oliver given a red, they wouldn't have changed that decision. That was such an obvious red I don't know how var didnt simply advise him to change it, but you can see refs bottling calls now.
I'll say it again, officiating is worse than it's been in my lifetime, with a huge drop off in the last 2-3 years.