Writing anything beyond SMS-length on a touch device, I end up popping the keyboard up and down repeatedly to give what I'm writing a useful amount of screen space. With swipe entry, my raw input speeds of English are much better than with some kind of thumbpad, but watching the keyboard still means ignoring what I'm typing and going back to fix typos.
I like how touchscreen swipe input seems to flow. I like how a physical keypad can be used without necessarily looking at it, and how it doesn't reduce the view of what I'm writing. I haven't used a stylus interface that I've particularly liked because it seems like the worst of both worlds.
All those together are why I also do my best to avoid writing anything sizable on a mobile device.
I like how touchscreen swipe input seems to flow. I like how a physical keypad can be used without necessarily looking at it, and how it doesn't reduce the view of what I'm writing. I haven't used a stylus interface that I've particularly liked because it seems like the worst of both worlds.
All those together are why I also do my best to avoid writing anything sizable on a mobile device.