I'm going to want a source on this claim. While mobile keyboards are "alright" for messaging where you can get away with errors, they're not the kind of thing

I'm going to want a source on this claim. While mobile keyboards are "alright" for messaging where you can get away with errors, they're not the kind of thing you want to be using for prolonged periods, ie. writing documents or long emails. They're slow, error prone, and tiring because of the unnatural thumb movements. For any significant amount of typing and where accuracy is needed (a single letter wrong is more understandable than being replace with a similar dictionary word), keyboards are still preferred.