There is nothing more powerful than well-informed optimism. It has to be well-informed though. The "everything will be fine" type of optimism may also...
The post contrasts two types of optimism: well-informed optimism, described as the most powerful kind, versus a vague "everything will be fine" optimism. It argues that the proactive, curiosity-driven "what if we tried x?" approach is more useful than passive reassurance.