That is something I've noticed too. Not a single one of the highly successful people I know is one-dimensional. They're all well-rounded human beings who spend time indulging whatever passions they have.
The only ones I know who are slightly less well-rounded but still successful, as I mentioned in another comment, are the corporate successful types - imho because they have less of a choice about how to manage their time.
The only ones I know who are slightly less well-rounded but still successful, as I mentioned in another comment, are the corporate successful types - imho because they have less of a choice about how to manage their time.