Bogie, i hear ya.

Let’s examine that ‘fairness issue’ from yet another angle: Is it fair, for example (not making any accusations here) that an adult teacher hold the best and brightest back, in order to boost that adult’s career metrics?

And, in re your point, we’ve all seen far too many bright kids lose motivation and idle through what actually is half the only dedicated-to-learning part of their lives they’ll ever have (or ALL of it if they don’t go to an undergrad degree).

Have we seen the converse?

Any rowdy or unmotivated students ‘rescued’ by proximity to the motivateds? One can probably say, yes, maybe, but that wouldn’t be the way to bet, would it?.

And the size and certainty of the sacrifice on the one hand is way, way out of proportion to any hit-or-miss marginal possible effect on the other.