I think that's probably right. A ton of B2B opportunities in market niches that aren't well-served today. (Or could be served better.) I assume a lot of people would consider that boring but a well-targeted B2B coming from people who really understand the market space has a lot better odds than becoming the next B2C company that everyone is talking about.

New companies create new workflows. New workflows create new problems, which become opportunities for new companies. New companies create new workflows, which create new problems...

any examples? At this point, it seems everything has been already build (saying as a person who only worked in IT and don't have visibility on other industries, but would like to get some)

Everything was already built in 2005. It turned out that the more things are already built, the more things people build, and that requires building even more things on top of it...

Are you saying you think we are living in the best possible world and you see nothing to improve? Many people feel otherwise, and they are the ones launching companies.