The kid would also need to have extremely high emotional intelligence and resilience to survive in society, especially during their school years. Beyond the existential dread (seeing clearly every horrible thing), isolation (being unable to communicate with others who can't comprehend things on your level), and bullying (mostly by adult teachers in my case), there's the possibility, beyond even social problems, of real mental disorders.
>Highly intelligent people are 20% more likely to be diagnosed with autism spectrum disorder (ASD), 80% more likely to be diagnosed with ADHD, 83% more likely to be diagnosed with anxiety, and 182% more likely to develop at least one mood disorder.
This is just talking about Mensa-level IQ. Imagine the suffering an IQ of 1,000 would cause.
Unless you can roll out super-intelligence on a mass scale, it's going to be horrible for those who get it. Even if we did modify an entire generation, imagine the horrifying generation gap problems. It's bad enough waiting for old people to die so society can change for the better, imagine how extremely amplified that would be if youth were literally 10x smarter than the average adult. The youth in that situation may just rise up and kill everyone who stands in the way of progress as they see it.