[pork]

I think there's a vast sea between "people who don't know how to use email" and "computer literate", and it's disingenuous to make that a false dichotomy. There's a large population of people within biopharma, manufacturing, tech, and financial corporations, software engineers included, who are really fine tweaking and managing their email filters and don't give a damn about "email killer X", the reason generally being that the cost of learning a new "email-replacement" system often outweighs its benefits.

Which is not to say that you don't have a point either, but rather just that your assertion of "simply isn't true" well...isn't true.