You say there’s ‘no real reason’ not to trigger a follower event, but at the same time is their sufficient need? Hundreds, if not thousands, of streamers using follower notifications in one form or another that is perfectly suitable for the needs of themselves as streamers and for the value it provides their viewers. As of right now, polling the API does the job and I’d rather Twitch spend development time working on more important areas than an additional implementation of something that is already possible, it just happens to be in a different form that you would like.