I think they think that by allowing them to weigh in early they are helping them.

In reality they are enabling them to pull a lot of weight. Kids that have to weigh in and wrestle will only cut to where they can perform a short time later.

Guarantee that kids that are pulling alot and then have to step off the scale to on the mat will have a different thought process after they do that many times.

It would for sure drive kids to wrestle closer to their "walk around" weight.