(NOTE: I thought I remember this being possible and did some research (global swatches or something), but it doesnt look like it was implemented or maybe it was removed. If there is a workaround for this, I would love to know.)
It would be awesome if you could set primary and secondary variables to attributes; like SASS. In a late development decision, I decided to change my primary and secondary colors to something else and had to go through and change it everywhere those colors lived. It would be amazing to be able to make quick changes like that on the fly just be changing the set primary, secondary, etc. variables.
Ex: something like this