In theory, maybe, but there are many people who are fluent in basic English but who can't usefully communicate technical matters like bugs (except, perhaps, to someone who already looked at that specific problem with them).

Edit: And, in contrast, I've met people who I had a hard time communicating with in spoken English but, had no problems with once we did our communications in writing or with a written point of reference.

It's a prerequisite until the powers that be realize they can save money by dropping it.