One challenge in this is how to prevent permanent alienation between the masses & high achievers where you separate them at increasingly earlier points of life.

I went to school in a small town where I still shared some non-core classes with the masses, and only had separate tracks for some science/math courses starting at say 13 or 14 years old. But I still had gym/art/homeroom/etc with the masses right until graduation at 18 years old.

The trend has of course been to split the smarter kids out at younger and younger ages.. you see completely separate smart kids schools starting at 14 or 11 years old. You hear stories of pre-K and kindergarten programs that require your kid test in, as if they can asses the intelligence of a 3 year old.

As a society I would observe it makes the masses more resentful & distrusting towards "the elites" and "the elites" more oblivious to what the life for 99% of the country actually entails.