It seems at least as likely that the microphone feature, as a non-working component of a future product upgrade, was omitted at the request of attorneys reviewi

It seems at least as likely that the microphone feature, as a non-working component of a future product upgrade, was omitted at the request of attorneys reviewing the product literature so as to not create a false expectation of that unreleased feature. I've worked on several products that had capabilities that we were told by attorneys could not be "advertised" (i.e., no references to them) until the complete feature was ready to be announced.