My personal take on this is that high IQ quickly turns into a liability in childhood. Particularly when entering the school system.
I believe the words "bored to tears" summarize the experience quite well.
While the majority of pupils get a standardized curriculum designed to keep their interest at a steady pace, pupils with a high learning capacity get no such thing. If they try to learn faster, it doesn't fit with the governance and management model within which the teacher must operate. Therefore, most teachers are at a loss when faced with these statistical outliers.
Also, other pupils may experience emotions of inadequacy and unfairness when a fellow pupil just blasts through the material in minutes that would take them all week. This may lead to the high capacity pupil being a target of some unfortunate group dynamics.
Since schools have no governance model for this, the high learning capacity pupil's school experience is essentially unmanaged. At a loss, society almost invariably resorts to platitudes like "No need to feel sorry for them, because they are so fortunate to be smart. We must focus on the pupils that struggle."
A few years down the line, the pupil's inner motivation may be completely replaced by depression, self-blaming or worse. Then the platitudes take a turn for the worse with blaming the pupil's willingness to work: "In fact, high IQ can reduce grit, since clever pattern matchers use their cleverness to avoid working hard on the toy problems of childhood."
Fortunately, my own school days are long since gone. Without blaming any person in the system, I can say: "Good riddance!" to this whole pitiful affair of how society treated me as a child.
Instead, I can draw attention to this problem by saying clearly that these are children that never asked for these gifts in the first place. Let's as a society realize that what we are doing to them is absolutely wrong and woefully irresponsible.
Fortunately, at least one western country has political attention on this right now. I will work hard and with "grit" to make sure that my experience and observations can help in creating new policies. In particular I wish to address how to practically leverage the pupils' own drive to learn without incurring social/peer stigma or ridiculous costs.