[UrsaMedius]

However, schools should never treat stupid and intelligent children the same. Not everyone is cut out to be a rocket surgeon. But your argument means that we should hold back all future rocket surgeons and bring them to a lower level of privilege, i.e. dumb them down. This is neither in the interest of the children (stupid as well as intelligent ones) nor is it in the interest of society. We do need rocket surgeons...

I agree that this can be a difficult balance to strike. But I think it's also important to keep the door open for children who mature a bit later. Stamping someone as "not gifted" by excluding them from a "gifted" group sure seems like it would cause problems, especially for younger children. Of course it's a difficult practical problem to solve; to give every child challenges on their current level.

Also, while there are surely variations in intelligence that are "from birth", I do not know how that compares to all the variations caused by different educational privileges; having parents that have a lot of time to read for/with the child etc. It sort of comes down to "equality vs. equity" I suppose - and that is not a simple question.