Great questions. Maybe in part what has changed is how connected the world is. It has never been easier to travel, many of my friends have visited Japan, which would have been unheard of some years ago. Social media such as Steemit also helps with communication and getting to know people at the other side of the world.
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You're right. People have so much information about where they'll live or what challenges they'll face, and even what kind of people they'll befriend. In a way, it's a shame - takes the fun out of travel and moving. But on the flip-side, reduces culture shock and homesickness (I guess)