> I don't think the commitment to true excellence necessarily detracts from other possible commitments in the long run. E.g. DFW was a writer of singular ability, and he was, at various points in his life, dedicated to tennis, philosophy, and mathematics.
DFW is a good example, actually. As far as I know from reading his nonfiction, in tennis he never got beyond 'very promising youth' but dropped out at some point when he realized he would never be truly great; in philosophy, he published an interesting thesis which was well-regarded - but that's not a career in philosophy, much less world-class philosophizing, and then he dropped out of that; and I'm not sure what, if anything, original he ever did in mathematics. What he is remembered for is being a writer (with interest in tennis, philosophy, and math), and being a writer is what he spent most of his short life doing.
Fact is, we don't expect world-class people to have many real interests or sidelines besides dabbling; look at the recent post on Heddy Lamar. 'My god, an actress with a brain for non-acting things, who invented frequency-hopping?' You could hear brain going 'foom' in the distance.