Let's look at it a different way: instead of a race coming with mechanical elements, what if you have to have those mechanical elements in order to be that race? IE in order to play a dwarf, you must be proficient in Craft and have the feat Stable (from your background or whatever) and have a minimum of a 13 con (from rolling or point buy). Being a dwarf confers no further mechanical elements, but it does mean you get to play a dwarf and all that entails from a setting and lore perspective. Would you play a non-human then?