Ever heard of hot chassis? Yeap!, you brush your hand on it, you will know what is hot chassis.
What I mean is, you ought to know what you are doing and this kind of work is not for the average Joe on the street, right? DUT are always exposed.
Yes, warning message is necessary and responsible action from manufacturer, part of the usual disclaimer of liabilities for the average Joe using their instrument.
but they already said they can handle with it, they are trained, so to speak. So what's the worry?