In other words 20% of jobs were distributed via the much less efficient and risky approach of job adds, formal applications, HR scanning CVs for buzzwords and credentials, lengthy interview vetting process, etc.
I agree with OP. It is empowering that you can achieve more when working with people you know well and trust.
You mention that this makes it harder for immigrants. Of course it does. Immigration is disruptive to once life. It only makes sense to migrate, if the prospects at the new place are much better, despite effectively loosing access to your existing network at home. Of course it will take time, to re-build such a network.
I've moved within a Canadian province (about 750km) and it was pretty disruptive.
Friends and family are far, kids are challenging without that village, nobody knows you from around, etc. Like you say, though, the new place looked much better than the old one.
Couldn't imagine doing it from half a planet away.
I agree with OP. It is empowering that you can achieve more when working with people you know well and trust.
You mention that this makes it harder for immigrants. Of course it does. Immigration is disruptive to once life. It only makes sense to migrate, if the prospects at the new place are much better, despite effectively loosing access to your existing network at home. Of course it will take time, to re-build such a network.