Yes, yes, yes, they know it all better ... so there is a theory for that and a theory for this. Reality is they know squat.
Well, we know more than any earlier generations of humans have ever known, that's for sure. But we're far from done (barring some unforeseen catastrophic event, of course).
The ugly truth is that TRUTH doesn't evolve. Something is true, today, tomorrow and thousands of years from now IF it was truth to begin with.