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IMO, keeping kids in holding pattern during elementary years will stunt their growth.
Yes, there are many articles on underachievement which raise awareness of this. A quick search of the Davidson Database shows 234 entries on underachievement.

With public schools being evaluated on closing the achievement/excellence gap, stunting the growth the gifted kids (sometimes referred to as cutting down tall poppies), may be employed purposefully as a strategy to ensure equal outcomes.