Then they need to left free to excel.
“You didn’t do that” — Thief in Chief (liberty, money, whatever)
I was always astounded that so much gifted education isn't at least supervised by gifted individuals. What I always found to be the biggest flaw was the quest for perfection and acceleration. Gifted children need to try things, getting them started out on a topic, but let them make their own discoveries. After that period, it's important to both establish the facts and to recognize the independent discoveries by that child.
A lot of gifted education I've encountered tends toward one extreme or the other. It's either all facts and perfection with no discovery or all discovery with no facts. In many cases, I suspect that the gifted child does better with some of the very good online public schools.