I'm talking about the situation where you can't login into the site without first confirming your email. Yeah, I know it sounds crazy, but owners initially insisted on doing it that way on two separate projects I was involved with. So customer has never seen the actual product. They'd register and then instead of immediately going to their email client to confirm it and login, they'd go somewhere else, and never come back to test the product. In many ways this is a similar process to the one with password links, and I think it would have the same effect.