This sort of tracks for me. The smartest people I know as adults mostly fucked around a lot and had wide interests that all culminated in them doing a great thing greatly. The smartest people I know as kids spent hours grinding on something and crashed out in college and are mostly average well-to-dos now.
I'm reminded of a meme on Facebook my wife showed me that was a two-dimensional graph of SAT score vs. GPA. The corner with the highest SAT scores but the lowest GPAs was shaded in and labelled "These are the people I want to hang out with."
How many of the children in first group didn’t you meet?
For most people the set "the smartest people I know as adults" inludes no elite performers in any area.