I have no issue typing full speed with two thumbs on a large phone in portrait. This incidentally enables an 80-column terminal.... That is, even on QUERTY on

I have no issue typing full speed with two thumbs on a large phone in portrait. This incidentally enables an 80-column terminal.... That is, even on QUERTY on a laptop keyboard I get significantly higher typing speeds due to the use of more than 4 fingers combined with the lower travel distance (measured relative to the target precision), along with the distinct tactile feedback of whether you hit the key or one next to it. Tactile feedback, like a blackberry keyboard, would allow even higher speeds and, most importantly, allow to keep the eyes off the thumbs, as they are needed to use typos as feedback and also to correct these typos.