I think he makes the point pretty clearly that heads down data entry simply comes with different requirements than web surfing. Try to order not one but 200 books a day from amazon and then let's talk UIs afterwards ;-)
Either you learn how to make it work in the environment, or you change the environment.
I think also that my OP could have been stronger pointing out that the job is completely doable (in fact I've done it), with a sort of "here are the problems you will face" feel.