I wasn't implying that somehow just the Anarchist system contained tyrants, gangs and warlords, but that these types exist everywhere, and given half a chance will take over anywhere.

You say "it would need rules to prevent it being taken over by archons". So who would make these rules?
Presumably some group or groups would have to come together to establish these rules. Once that's been done you have a Government. since that's what a Government is. A group of people who establish the rules and laws for a society.

Governance means management which requires control, since it's not possible to manage something that you don't control.

It seems to me that you are right back in the situation of the founding fathers. So why try to re-invent the wheel when we can instead examine the Constitution and see when, where, how and why it has failed to live up to expectations and make any and all necessary adjustments so as to prevent such failures in the future.

It should be interesting to see Luke and Jeff's take on these experiments.