I think there's a lot to learn in the design philosophy of giving the power to users by default, but if you don't give your users the tools to learn this power they're going to have to ask questions if they want to yield it
I'd appreciate it if more developers considered 'discoverability' as a core part of their design philosophy. I think the author is close, but when you need to ask someone/search 'why is this green?' that's enough of a barrier that most people won't bother asking (or it'll be a small enough issue that they don't consciously notice it).
There's even a generally accepted solution for explaining semantic colours, a legend. Might be nice to have one down with the F-keys.