Easy for him to say. Part of what drives achievement in people is the notion that there has to be meaning and lasting value in the things they pursue. And a lot of us just can’t turn that off even after we realize that what constitutes “meaning” is very contextual and fleeting. Meaning of 10-15 years ago looks very much like a ridiculous waste of time to me today, and with the dubious benefit of this “experience”, it’s also hard to convince myself that other pursuits are meaningful. I suppose this could be why people turn more towards religious/spiritual side later in life. There meaning does not require any proof, it’s postulated and immutable