Revelation - regardless of the faith system that professes it has to mean something. I believe that there does have to be a central and coherent core of beliefs around which there is at least general agreement, persistent exploration and "diologue". Beyond that I believe that your argument against imposed rigidity makes great sense. 
The basis for "sacred space" and its corollary, dialogue,among all is not the revelation issue - ephemeral or from God tho it might be. It is I believe the escalation of human into the supposed revelation and associated systematization. Civility, morality, empathy, discernment, reason, logic, perception and community are human issues and should form the basis for "how" we deal with the esoteric. In other words: render unto ones' particular god the things that are of that god; render unto the creator that which is fundamental to creation: human and humanity.