I'll start by saying this: All anyone honestly ever does in life is try to avoid outcomes they don't like, and try to realize or manifest outcomes they do like. But these are actually not separate things. They are just different perspectives on the same goal.
When a person's outcomes seem more poised to break towards the good, we tend to think of them as operating from a point of confidence or optimism. And when things seem more likely to break towards the bad, we think of the person as operating from a place of fear. Which is also the point when we might say they are operating under some form of coercion.
But there's not a definitive point when a person is operating from one stance or the other. It's a continuum.
But one challenge with talking about this state of affairs is that there isn't really an equivalent word to "coercion" that has a positive connotation.
So although the word "coercion" has a bad connotation, I will admit that in this context, I'm using it to describe all manner of pushes and pulls in a relationship, whether they are positive or negative, operating out of confidence or out of fear. And it's not because I'm trying to change the meaning of "coercion", it's just because there's not a better word to use, and because whether it is "good coercion" or bad coercion it really is just a matter of judgment and perspective on the same continuum anyway.
But so this being a continuum of experience we're talking about here, there's no way to definitively determine the point when someone is being coerced in the good sense or coerced in the bad sense. And as Dustin's article mentioned - and as anyone who knows a bit about life must realize - there will always arise characters and situations where people will be operating more from a standpoint of fear, than from of confidence.
And so in any real life setting, operating under any social system, there will inevitably be times when both good and bad types of coercion become unavoidable. And it's best that we acknowledge that, rather than just saying that some system, like anarchy done right, magically avoids the bad type of coercion. It can't. Because we're dealing with real life, and real people, who will be scared and operating out of fear sometimes.
Which is to say, there will always be coercion - of both the good type and the bad, the confident and the fearful.