Software does offer exactly that. Last I checked, a hash table works the same in New York and Ouray. And you can remotely contribute to a project from pretty much anywhere you get Internet. Sure, that excludes e.g. large parts of Africa, but let's be honest: People don't get into medicine because they could always get a job in Africa. Yes, there are some who have that calling, but most like the developed world just fine.

So the issue is not with the profession per se - that leaves the employers. And there, you have a point for large swaths of the industry. But it seems the world of web/backend development is a bit more flexible there, no?