I was at a talk that Po-shen Loh (https://www.poshenloh.com), a math education innovator, gave to parents while their kids were in a math competition. Much of it spoke to this point and beyond. He was giving advice related to college admissions and how kids are pushed these days. My distillation won't do it justice, maybe it a form of it is online somehow.
He described the "freight train" mentality where kids are pushed to do things because that's what is "needed" to get to college. Advance math and science as much as possible. All the honors and APs possible. All the competitions. Do thing X because that's what they think a college will want. Complete academic focus heavily driven by the parents. They can't change direction or slow down.
When he interviews for undergrad/grad/teams, he asks questions related to the candidate's intent and narrative, rather than the tally of accomplishments. Also, he asks things like "you've finally sold that company" or "licensed your award winning research breakthrough", then what will you do? [touching sorta on the remaining 20% you note].
What he's teasing out is their passion and character (of course, capability has to be there too). Because he is composing a team/cohort who will fulfill the mission of the organization, and that person will need both to think for themselves and to collaborate. Soul-less people who churned because their parents forced them too won't make a great team.
It relates to burnout. It relates to lack of passion once the parent influence is removed. It relates to tunnel vision and years without agency.
A person in the audience said they were considering their son quit as captain of the swim team to get a marginal improvement in their Calculus grade. Dr Loh disputes that and a corporate recruiter in the audience chimed in agreeing -- the parent was completely missing all of the benefit, direct and meta, of that athletic and leadership activity.
Another metaphor he used was between a "black hole" and a "star" with respect to the attitudes and tendencies of students. The two are energetically very different, despite working with the same physical principle of gravity. Contractive versus emanative. It gets to be pretty limited what can be done with that contractive energy, but emanation has so much creative potential.
He's built these mental models after teaching and interviewing many people. Pulling all that together to say, maybe kids won't burn out if they aren't on a freight train and given agency (combined with mentoring) to advance themselves optimally.
[Also noting that in that model, it's totally OK to be intensely devoted to something and then pivot when it makes sense for you.]