<sarcasm>Should we also add an IRC client to Microsoft Word? Why should it not expand beyond its primary task, after all? How about an embedding graphics editing tool in Mozilla Thunderbird. You don't have to use it if you don't want to, but why stop those who want to from doing so?</sarcasm>
Audio and video are related to IRC since all three methods can be used to chat.
In your examples none of the things you're saying should be added to those programs are related at all.
