Functionally talented and gifted students autodidact to their interests which is a much better outcome than institutionalized bullshit schooling. I deeply disagree with your assessment that institutional learning is some universal booster for smart people and shows your own personal bias. So in balance of your position: I think it grinds down a students willpower and spirit to be placed on a pedestal to be given more resources than other kids. I’m willing to meet in the middle and say either system is equally depressive of students for learning in a way that leads to benefits for society.

Learning from teachers is a skill that can be learned, and taught.

Being unable to learn from others or collaborate with others will vastly limit what gifted children can accomplish in life. Not teaching those skills as skills sets gifted children up for failure in college and the workplace.

There's also other skills that are very often difficult for "gifted" kids to learn: rejection sensitivity disorder, for example, is often comorbid. Somatic exercises, learning to pay attention to our bodies and not just our intellect. Note taking. Slicing problems into small pieces it is okay to fail. All of these are things conventional education assumes kids will pick up on their own.

We have actual studies on the results of unschooling gifted kids, and the outcomes are not good. It is much better if they can be coached on skills they don't have, even when those are skills other people acquire passively without having to be taught.

It doesn't necessarily take "more" resources to educate gifted children: it takes differentiated resources. "Your brain works differently, so this classroom works better for you" is just as true for learning disabilities as it is for "gifted" students.