It was 100% the best thing about the World Cup. Rules actually were enforced.
Except when they weren't Partly because of their own "Clear and Obvious Mistakes" rule, which wasn't enforced at all, but mostly the stoppage time rule was just completely ignored. Don't remember which game, but there was a game when there should have been about 8 minutes of stoppage time in the last 10 minutes alone, and barely none was given.
Anyone thinking this will lead to fairer games with fewer big decisions being given to big teams are in for a rude awakening IMO, it's just another step towards the big teams not missing out on a late penalty.