I went to school with several kids who were gifted mechanically. They suffered in school. It wasn't just not beneficial. School was directly harmful. Had they been able to spend less time in school and more time working, they would've been much happier. Instead, school became a kind of purgatory they had to endure.
There are also situations in which kids are in a bad home environment but are essentially bonded to their parents by the fact that they cannot work. To be 100% clear, this bill sucks. I'm completly against it. But there is a form a child work reform that should happen IMO.