Well many of us around the world have been running '"fully capable, no-compromises" computers' on mobile networks for years and so far Armageddon hasn't happened.
"Armageddon," in this case, is more about price gouging and control than anything. They're not worried what people will do to their shitty network, they're worried about the bottom line.
What if everybody ran an app that allowed you to SMS people for not 10¢ a message?
Yes—you just lose the [legal] ability to connect it to the networks of any of the major phone providers. They're all too scared of what a "fully capable, no-compromises" computer could do to their network if it so chose.