Yeah, there is no evidence asiatic features are linked to the ice age or habitation in the north.
Fact is a lot of human features are a result of sexual selection instead of natural selection. Meaning certain traits are considered attractive and thus preferred and propagated in a segment of humanity. Blue eyes, and straight hair are good examples.
Good point e.g. West Indians better than average physical build may have been a result of the same phenomenon..
Its difficult to prove anything like this, so all theories will always be based on conjecture..