[sneak]

And indeed, reasonable people can disagree on the extent of what is safe to assume and what is not, and can discuss the nature of their belief in the reasonability of those various levels of assumption.

It turns out that if you abide by those linked rules, casual friendly discussions (things that are nonessential, for the most part) are pretty much ruled out. I find myself more often communicating with people who I have no explicit business or goal with, in social settings, and abiding by rules for cooperation on a team/task would make me a very boring person to speak to, indeed.