This does not seem as much of a trouble as having a preferential hiring policy for some classes of people and then having the ability of these people doubted no

This does not seem as much of a trouble as having a preferential hiring policy for some classes of people and then having the ability of these people doubted not just at the hiring time but through their entire career. To wit: I am a foreigner living and working as a software engineer in the USA. My English is far from perfect and a lot of people assume I am dumb just because of my thick accent. I failed few interviews because of this. I have absolutely no problem with that and am happy with my career. My achievements speak for me. I would not be as happy if this had been made a "diversity" issue and people with heavy accent were given advantages in hiring. This would forever invalidate my achievements as a proof of my competence. I would actively oppose any moves to establish such policies and would not approach any company that had them in place.