Oh man, I agree with shorter intros by far. But the reason we have them in the first place has to do with the fact that every video is going to be someone's first impression of your channel. We just wanna make a good impression, namely that we're decent at making content that's entertaining to watch. Whether that means decent audio mixing, fancy visuals or editing, or whatever else, that first impression is the only thing between you sticking around or leaving to find someone else to watch.