Maybe you don't need to go to a dense coastal city for your first job, but what about your second job, and your third job, etc? Very few jobs in tech will last your entire career. You could take a job in some random small city, but you'll probably have to move again in five years.

These tech hubs exist for very good reasons. Maybe you can make some more hubs, but you'll never spread these kind of jobs evenly all over.