Dude in SF is more likely to bump into other dudes in SF and talk about system design, math or AI or competition or best practices or stacks.

Dude in Indiana doesn't have that opportunity. You'd say but Internet, but things like motivation, inspiration, innovation comes from a certain external factors (which we still haven't figured out).

That's why even with massive internet penetration, it's the tech hubs that keep pumping winners and hits