Plus less mental burden for everyone. You get to a light, you press the button. No need to wonder if there is going to be a button or not, no need to have to lo

Plus less mental burden for everyone. You get to a light, you press the button. No need to wonder if there is going to be a button or not, no need to have to look all around - in case the button was hiding somewhere else.. The button is there..press it.