If someone can't communicate their knowledge and skills that's one problem, and a very common one with or without an accent barrier. If someone can communicate

If someone can't communicate their knowledge and skills that's one problem, and a very common one with or without an accent barrier. If someone can communicate their ideas and do the job and you don't want to hire them to avoid having to actually expend effort in communicating, that's a different problem, and it's not theirs.