The problem is that even if there weren’t brain drain, you’d still have less progress now because institutions trend towards bureaucratic risk “management” that

The problem is that even if there weren’t brain drain, you’d still have less progress now because institutions trend towards bureaucratic risk “management” that all but neuters talent. You could have someone 2x an Einstein or an Oppenheimer and they will never produce what either of those two did because the institutions they would work for today are fundamentally different than the ones Einstein and Oppenheimer worked for during WWII.