My three things list of Achilles heels are lack of storage memory, connectivity (library, backup, printers and good cameras) and decent browsers (poor mobile browsers and incompatibility with all the sites in my favorites).
In fact the smart-phones and tablets are designed to go with a home base computer for all these and more functions. We are collecting our lives in electronic form. I can't imagine using 4G or LTE and the Cloud for all this - the cost alone ... !! WiFi and a real computer plus backup is the only sensible route, for now anyway.
Keep Up with TechRepublic