"Holding a child back because her motor skills/processing speed haven't caught up to her other abilities is like..."

... not giving a student-teacher his own classroom because he hasn't learned about asynchronous development?

Sorry for the sarcasm, but skool-think like that really irritates me.

I like the piano comparison... but I'd drop the reference to Mozart & replace it with the generic "child."

Being offended is a natural consequence of leaving the house. - Fran Lebowitz