I have had them tell me on several occasions to put my iPad pro away when i had the keyboard out typing on my leg. I fold the keyboard up and all but one time they never said another word. One time I had to detach the keyboard and slide it under the seat in order for her to go away.
Based on other observations the difference between a pad and a laptop seems to be an attached keyboard.
Of course my sample size is insignificant and YMMV
