> I think if a person had those same advantages (e.g. could spend 5 hours thinking about what to say next) we could all hold outstanding conversations, or if we had read every book ever written I think many of us could write a very popular book, if we could read every singe company's P&L statement in a few seconds we could invest better than an index fund

I’m not so sure of that - to get average outcomes in these fields it’s a matter of time, to get above average or extraordinary, you need talent/intelligence/taste.

And the bar the parent set is at extraordinary.