The only issue I can imagine is that your mistakes might be more likely to form real words. The way dvorak is set up so that the vowels are concentrated means a

The only issue I can imagine is that your mistakes might be more likely to form real words. The way dvorak is set up so that the vowels are concentrated means accidentally going one character to the left will probably result in something intelligible looking, if not a real word ("beg"->"bag"), whereas in qwerty you're likely to type gibberish ("beg"->"bwg"). Obviously it's easier for auto-correct to notice gibberish than wrong words. I see no reason that shorter travel time would impact it though.