1. Mature leaders do not work under bosses (unless their greed meets really good salary). There are plenty of places to work at without top-down culture.
2. Mature leaders have values and personal agenda.
3. Mature leaders have manage-up skill and use it to align their manager expectations with their values.
Even the most powerful CEOs answer to the Board (which are essentially their boss), with few exceptions. And for those exceptions (Mark Zuckerberg, Elon Musk etc.) probably aren't what most people call "mature".
I think you misunderstood that point. There’s a difference between a leader and a boss in the style of management. In old school command hierarchies managers are bosses and give orders. In modern people-oriented structure managers act as an oil in the engine, enabling their direct reports to achieve their goals with their knowledge and skill. They may not know better, but they know how to delegate and trust.
