Have to say, the way it's being applied is so silly. Also imagine being a defender, having a good game with your defensive unit, always getting the offside line just right (so practically allowing nothing) but because the game is being played on, it seems like they're allowing chance, after chance, and aren't tracking the runners well. Despite the offside situations, the defenders mentally get a lot more worried, while the strikers will now feel they're very close to getting it right. If the call comes right away, the defender is on the mental high ground, and can continue to play with confidence. These situations test the nerves of the entire defense every time.
This has been a guideline for quite some time in (men's) football. I think the problem is how it's implemented at the WWC, not the concept behind it.