Conversely, whenever I'm trying to get real work done on my phone I feel like I'm looking at and using the internet through a drinking straw. The interface just doesn't have enough bandwidth.
However, maybe there's a crop of people who don't feel this way and actually prefer phone apps? I'm definitely not going to tell these folks they're "doing it wrong", but they're ignoring at least some segment of the market if they only have a phone app.