[passion__desire]

I think stoic ideas are from an era where their circumstances made them have those principles. We don't live in that era. It is possible to affect others and the associated cascading effect that can bring about a change in others action which were affecting you negatively. If Naval's idea of "individuals having leverage holds water" directly implies that you can change others, albiet slowly. If your reach becomes big enough that it becomes a threat that "other actors" need to curtail that reach through "algorithms" is another evidence that you were indeed having effects that they didn't like.

[HPsquared]

You think Marcus Aurelius was unable to affect other peoples' actions? That's not the idea. The point is that you can't directly make someone else think or feel a certain way, only act on them externally.

[passion__desire]

If causality holds, acting externally will have changes to internal assessments assuming good faith dialogue. Plus Marcus Aurelius was helpless in that it would take him lot of time and energy to give personal attention to each individual and clarify their doubts. He didn't have the technology to record his thoughts on a topic and refer people to it.