First off, I'm a firm believer that though powerful, they are not a substitute for a real computer in many instances! Proofing art is plain ridiculous!
I've had folks sit in my office demonstrating a true lack of knowledge and skill with them as well.
A week or so back, I lost a job (and half an hour) trying to have one guy try and figure out how to get me a high enough quality image on his phone to enlarge and use for a memorial shirt.
(even had friends calling to order shirts the next day assuming that all went well)
Why, when we send pics does it give us the choice of quality? Even our small ones were much larger than what he had!