Added time in football is a mess imo. They literally never add on enough, I'd be in favour of 3 minutes standard time at the end of each half and anything else added on top of that - as to me that seems at least how much stoppage there is, even in a well-flowing match. When you think of how much time the ball actually spends in play, it must be about half of the game time, sometimes less.
VAR really needs to be a stop the clock situation if it's to become commonplace.