It may be different based for others based on hand anatomy, but at least for me the index finger is so much stronger than the little finger, that it feels more comfortable moving it one space to the left, especially on keyboards with heavy keys (like model M).
I will admit that I had never considered things like this (there's a couple of you making a similar point). It's a decent argument. Maybe I'll revert to the default and see if I can handle the change.
