[simonh]

I’m just guessing, but community and social support networks are vital for survival and to retain access to potential mates. You don’t deliberately distance yourself from that without a really good reason. Also the nice you have built experience with the terrain, shelter, food, water and material resources of a region why give all that up? Even nomadic cultures have a range and set of routes and locations they know and visit.

Suddenly changing climactic zone is also probably difficult as the different climate, flora and fauna might require very different sets of skills.