I love symbol overrides, too, and I appreciate your articles. Part of me, though, wonders if you’re losing something with one button + a collection of parts. I like seeing all my button symbols in one place on my symbols page. It shows me an inventory of what I’ve got in my document. When I need a button, I choose one of those (primary, secondary, tertiary) then change states (normal, hover, etc) by swapping the button symbol. If I find a need for a different button, I can add it to my inventory. Your tools account for great amounts of variation in your buttons, but I think there’s value in encouraging restraint, too. Thoughts?