Hence why I harp in on two specific points "You don't want to piss off blind people" and "You don't want cross browser compatibility to suffer" - most technical background managers will hear the second point and have a flashback to IE6 or IE4 and immediately start backpedaling, while non-technical background managers will hear the first point and wonder if AADP will end up suing them.

The statement I made is not a genuine expression of the most important reasons - it is a tool to persuade management using cherry picked boogiemen to scare foklks into the right decision... aka a bad faith argument made for the best of reasons.