I suspect our overall picture of early human development will have a type of availability bias to control for. The arid middle eastern climate / soil conditions

I suspect our overall picture of early human development will have a type of availability bias to control for. The arid middle eastern climate / soil conditions are more conducive to the preservation of remains so that is what you tend to find. How representative these finds of what happened in the huge Eurasia region? On the other hand the Africa / Asia land bridge would logically always have been an "interesting" area as the conduit for any population migrations.