Ultimately, we will find that a great many people (perhaps the majority) will identify as one race or another, or an identifiable mixture. Whether this is called arbitrary or not, whether it's more or less science based, race still exists.I associate eye folds with increased insulation, which have started multiple places independently, and the warmest is probably aided by the fact that eyes folds exist from Scandinavia to South East Asia to Inuits.
Individuals are a mix of billions of traits. The permutations are endless. The rate of mutation and adaption in which every generation of people a new unique blend of genes is created yet again. Never have human populations gone through so much genetic drift.
But people don't trace their ancestor by their skin color, or the extra amount fat that helps cover the tear ducts. Markers that are generally used to trace lineage don't really have anything to do with noticeable phenotypes.