Not sure how much research backs this up, but I think it's a change in what's important. A 10 year old who copies someone else brilliantly is praised, an adult doing the same thing makes minim wage.

"Even prodigies who avoid burnout and resist social pressures are unlikely to make a big splash as an adult. The problem, notes giftedness researcher Ellen Winner, is that to make a major contribution in the arts, and even the sciences "you need a rebellious spirit and the type of mind that can see new things." Most prodigies, however, are acclaimed not for their innovation but "for doing something that's already been done, like playing the violin in the style of Itzhak Perlman." Only prodigies who can reinvent themselves as innovators, she says, are likely to leave a lasting mark during adulthood." https://www.psychologytoday.com/articles/200511/why-prodigie...