[ddoolin]

I like your point about cohesion. I'm not an immigrant here so, perhaps obviously, I agree. I have worked on teams and accents of those I have to collaborate with is a big factor in determining overall "friction". Often if the accent is too strong, it really makes the interaction dreadful because I (and others) want to understand you but it's difficult and embarrassing having to ask "what?" three times per sentence.

I don't think you need any better example than support call centers. How many people routinely avoid calling for support or simply loathe the idea of doing so because they're like to get someone with a heavy Indian, Filipino, etc. accent that leads to the scenario I mentioned above ("whats?")? When it comes down to it, it has a real cost in many ways.