I wonder if the solution is simply to focus and effectively use resources so you can be effective and ambitious in a reasonable number of hours. Which is fine for 99.99%. Only if you are at the helm of discovering a revolution in physics or changing the world in some other way then go all in when you have kids. Which today is rare since team work makes the dream work way more. Of course there is greed. If you are greedy that is a different thing.

Solution to what?