Open Sets as a way towards enlightenment

I have been exploring the issue of bounded and open sets, one thing that is often talked about is about being committed at the core and open at the edges, yet I wonder if we are missing an opportunity for growth here. I am part of a network that describes itself as A network of mission practitioners and communities who are restlessly trying to follow Jesus in the midst of a changing contemporary culture. The Ugly Truth full I cannot underestimate the support I have found within group and how important the space to be open and vulnerable with like minded people is. In many ways this group is not fully open (nor should it??) but this is what I am questioning. At one level all open groups are self selecting and will attract people around the ethos of the group etc, but open set groups for people exploring spirituality will mean the members come into contact with those they disagree with, those they think are off the wall etc, all of which if processed worked through, dialogued about, motives, passions and actions searched and questioned help us on the path to enlightenment. You can hear a talk on patience a 100 times but try living with someone you think is a Muppet, what has the greater benefit for the soul?