And the second point ... why should parents to do that with their random kid before that kid even shown interest? It is not like art represented some kind of career or lifetime security or even happiness in life.
He wasn't being dropped off a school at 7am, squirming in a chair until 3pm, playing video games before dinner and then doing homework until bed all while squeezing in a bit of time for sketching.
The vast majority of people probably benefit more from our current structure, but it does make it much less likely to have "genius" of the type we see in Michelangelo, Mozart, etc.
He was literally getting education in art. It is not like there was no structure.
> As a young boy, Michelangelo was sent to the city of Florence to study grammar under the Humanist Francesco da Urbino. Michelangelo showed no interest in his schooling, preferring to copy paintings from churches and seek the company of other painters. [0]
You can search other sources and you'll find the same: prior to apprenticeship he was not formally enrolled in any form of art education.
He WAS in schooling and parents sent him to that city literally for education. And then he got into apprenticeship for a vocation that was well paid and supported back then.
He was very much dropped to school and squirmed there to the forced extend. And very much, boys of his age could slack on school work in variety of ways - they did not played videogames, but they did played games in little gangs of theirs, hanging around and generally wasting time to the extend adults allowed it.
Boys and girls who draw well, have talents and spend some freetime doing that exist. They usually learn from youtube (today equivalent of him meddling with artists). They may be put into extracurricular classes, but no one sane will put them into apprenticeship for art - because art is unlikely to feed you.