Let's see if we go by this structure. How do you propose protecting the community from people or other tribes who wish to conquer the land?
Voluntary militias and mutual defense agreements. These are VERY effective. But, if the US is coming after you, you are going to have a very bad time. That's just how things go.
Who is responsible for the order to avoid chaos within and outside the community?
Ideally, external strife is external and IDGAF about that. Internal issues would be figured out via a variety of methods: duels, arbitration, etc.
Eg. Are we saying there MUST be specialised group to take care of this based on passion?
Nope. But... That tends to happen over time in a permissive group.
Are we assuming in this structure that everyone has the good intent?
Yes.
How do you forsee this type of community innovate if we each have our forte? Genuinely curious
With enough people, it would be very adaptable, especially with a shared mindset of innovation and cooperation. It takes a lot of work on relationships to build that kind of community.