> Sometimes you're not targeting the whole world and can assume users are office workers who have a reasonably fast desktop-class computer and a decent network

> Sometimes you're not targeting the whole world and can assume users are office workers who have a reasonably fast desktop-class computer and a decent network connection. Maybe. Just don't make any assumptions about their physical abilities, i.e. make sure business apps are accessible unless the task at hand inherently assumes a particular ability (i.e. is inherently visual).