Part of the problem here might be that the HN population self-selects for the personality type that wants to do "at least It+1" There's a larger population out

Part of the problem here might be that the HN population self-selects for the personality type that wants to do "at least It+1" There's a larger population out there that having mastered "It," will happily do exactly the same thing for the next 10 years.