While I like this promotion system, I think it lacks something like what the military calls "billets". If I'm a principal engineer and I lead two teams of engin

While I like this promotion system, I think it lacks something like what the military calls "billets". If I'm a principal engineer and I lead two teams of engineers to deliver projects then I should be compensated for my knowledge as a principal engineer, then I should be compensated for the magnitude of responsibility of being a team lead. They are, in fact, two separate things.