It seems like the idea of meritocracy - that the best professional for a given job is based on competence is substituted with one of diversity. Ie that in any group of size n, the personal qualities (gender,race,sexual orientation) of N+1 person joining the group is just as (or more important) that his/her core qualifications.
For example - why does company have to have engineers that mimic its customer base? Wouldn't it make more sense for them to have people whose job it is to figure out what customers want and then tell engineers to code it up?
Now - I am not saying that diversity is bad, rather that it's presented as a given, with no numerical justification.