I did 95% of my job on an iPad last year. (The other 5% was done on a client-provided laptop, not because it couldn't be done on an iPad, but because of client regulations around certain data not leaving their network.) I'm alternating between AVP and iPad this year, depending on the day and number of on-camera meetings.
To be clear, the iPad is usually connected to an external monitor, and I used a bluetooth keyboard and trackpad, but I find it a better tool for my work needs than the Mac. I understand that not everyone can do their job on an iPad, particularly Mac/iOS developers, but just because someone can do their job from an iPad doesn't mean it's not "real work." I'd argue that most office workers could do their jobs from an iPad, and a not-insignificant number of them would be better-served in doing so. But that's off topic for the AVP forum, so I'll leave it at that.