If the concern is really for privacy, enabling the Private Messaging function would take care of that. Each individual would have complete contol over who did or didn't have their email address. But somehow that is evil, too. I can't think of another board where even email addresses in profiles are not allowed. My mind is boggled.
I don't know the motivation, it doesn't make sense to me. I know that the first thing said to almost any poster is "buy the book". And calling a coach is often recommended.
I will live by the rule as long as I can stand it, because of all of the wonderful people I have met here. But, I fear that at some point, I will be gone, probably of my own choice. Which makes me sad.