I think they were rather saying that separating the functions of the device like input device, sound generation and output can have superior results because it

I think they were rather saying that separating the functions of the device like input device, sound generation and output can have superior results because it becomes possible to combine different (and maybe better suited) parts. This makes a lot of sense. On the other hand I do not agree with them that a combined device is as useless or bad as they make it sound.