>>139938891. Lots of people don't value games for their full potential and only see "winning" as the desired experience. They either play games just to cross it off their list, or as a timesink. So they don't see things like experimenting and practice as an appealing part of the experience. It's crazy how often people really do use things like guides to get through games, so they can't imagine a streamer might want to fail for a while until they get the hang of something.
2. People always love to feel superior to others and flexing that you know something someone else doesn't is an easy way to get that feeling. They also will usually forget the times when they themselves didn't know.
I stream (not a vtuber) and am borderline autistic about figuring things out myself and this is the conclusion I've come to.