For clarity though, I don’t mean literal predictability, I mean relative predictability from the individual’s perspective, which for some actual means life being predictability unpredictable; to some degree, I am, in part because I value the chance to improvise, but anyone that knows me would say that’s predictable.
As for population migration, statistics I had heard before, was roughly half of world’s population doesn’t move more than days walk from where they grew up and remaining in a given area is rarely tied to personal or regional opportunities or threats. Clearly my understanding might be wrong or things like climate change might force people to move; for example, roughly billion of the eight billion people on Earth will likely be displaced by climate change.
I might be conflating some word meanings here so please correct me as needed.
That said, I do value predictability and stability now, but being young has its own rights and values. I guess what I am saying is that we need to look at it as more than just x or y. There are multiple reasons for moving and lots of reason people choose to remain where they currently are. If pressed for one, I would argue convenience or maybe 'devil known'.