My whole point is that usability is not about small details but the ability to complete a task. The big picture. I don't use windows, I don't like it, but if [

My whole point is that usability is not about small details but the ability to complete a task. The big picture. I don't use windows, I don't like it, but if [it being impossible to tell which window is focussed] doesn't impede people accomplishing the things they need to do, it's probably a cosmetic, at best a minor usability problem.