If typing is hard then you're less likely to go back over your code and correct ...

timrobinson on July 24, 2012 | parent | context | favorite | on: Command line tools every web dev needs to know

If typing is hard then you're less likely to go back over your code and correct typos and minor errors. At any rate, hunt-and-peck typists tend not to spend time going back over the code and formatting it nicely.