I had the same frustrations, and found a way to control monitor brightness with the brightness keys: https://www.reddit.com/r/mac/comments/6kj0oh/use_the_real_

I had the same frustrations, and found a way to control monitor brightness with the brightness keys: https://www.reddit.com/r/mac/comments/6kj0oh/use_the_real_brightness_keys_on_a_real_apple/ https://www.reddit.com/r/mac/comments/6kj0oh/use_the_real_br...