I think the video review process is generally a good idea, although of course there are always areas that you could fine tune. I think the most important aspect of it is to find the balance between justice and practicality. Everyone strives for justice and fairness in theory and officiating that maximizes that would theoretically be possible - if we reviewed every single situation and corrected every possible mistake the referees made at some point, which obviously isn't practical at all. So you have to sacrifice some of that justice for the constraints that reality and competitive sports put on us and limit it to those kinds of situations that matter the most, usually that means plays that directly result in a goal (not) being scored or substantial penalties that are (not) called. I would suggest sticking to the most glaring examples there but then also applying a challenge rule that allows coaches to force a review as well - at the risk of them losing their right to challenge in further situation in case they are wrong. And there is one other specific aspect of the video review process that I would like to add to this as well: The length of reviewable scenes, especially when it comes to offside decisions. Keep it short, I think it doesn't help the sport one bit if we nullify goals because the zone entry 20 seconds ago was slightly offside. Only review those kinds of offsides situations if they are directly part of the creation of the goal.