I disagree with your idea of what successful content is/can be. I'm more about variety. If I walk into a library or a browse a magazine rack, I wouldn't be impressed if I only saw a book about tech.
What works for one, won't work for everyone. It's not always about content. If someone writes about trees, nobody cares. Who wants to follow a tree? The moment that individual adds their own personality into it and makes it about their experiences with trees, people follow. People follow people. I like motovlogs on Youtube. Not all motovlogs though. If the individual inside the helmet is boring, I won't watch. A combination of personality and content is important. That's why those plain writers who stick to writing basics do so poorly here. What would this post above be without my jokes about how my day started? Just another steemian yelling at clouds.