Note: I'll use the definition of anarchism described in the first quote.

This post was just to clarify my stance. I haven't started detailing what  I regards as flaws. Which I'll be mostly addressing by engaging with pro-Anarchist posts on Steemit, since it's more effective.

That Tucker quote was just to highlight the sort of anarchy I'll be addressing when I say "Anarchists" for example. Rather than any specific school of thought. 

At the heart of what I'll be "exposing" (I recognize this is hyperbole), will be the insignificance of anarchism, and conversely the arbitrary significance imposed on centralized government.

What if that external control is voluntary?

This is the case in many centralized government systems (and that's partly the point I'm making).
That in practice the focus on voluntarism is almost trivial.

 Delegating certain rights, which endow an entity with more control over you, to protect your interests exemplifies what I mean