Yes, they are separate, but if we still had a global slider, there would be a more _streamlined_ alternative to assigning specialists if you don't want to micro it to the last beaker.
The current system we have really doesn't fit the design goal of streamlining, isn't remotely realistic, and makes gameplay micromanagement hell, so what redeeming quality does it have?
Yeah, Civ games have historically been pitch-perfect recreations of reality.