| The question not being asked is how your audience changes A vs B in other ways than size. You can easily A/B test yourself into mediocrity by constantly optimizing for a larger, dumber audience. They stop liking your old content (despite your dumb faces, etc) so you make new content they like more, keep that cycle up for a while. And you end up making emotionally charged rage-porn political videos and have become the next Facebook/cable news/etc. This is also why the second or third album for a band is usually the best; they get popular and start letting their audience design their music and become repetitive and mildly awful. |
That's not how it works.
The most important factor to get views on YouTube is the recommendation algorithm. It makes a huge difference. YouTube will not even push your videos to people who are subscribed to you if the recommendation algorithm doesn't favor them.
As the click-through rate is an important part of how the algorithm decides what to recommend, you need a catchy thumbnail and a somewhat clickbaity title or you will be reduced to oblivion by people who use one regardless of the actual quality of your content. The story is the same with the length of video.
Veritasium made a couple of very good videos on the issue if you are interested.