I'm almost thinking of using "I've joined a cult" as my opening line, to get it out of the way.
I have been tempted to say "Oh, that cult Paul joined? I joined it too. It's pretty good. ... No, it's a bit complicated. You probably don't want to join."
(I swear I have not done this.)
This has been discussed some, but I don't think it's been the sole subject of a top-level post. I want to find out other people's ideas rather than driving the discussion into my ideas, so I'm asking the question in a very general form, and holding off on my own answers: