>>30Because they're essential to the interpretation. You can include non-diverging if you like, but it doesn't help anything. I'm not sure what's going on with this infinity:infinity nonsense, but many worlds already presumes an uncountably infinite set of universes.
It's not about measuring other worlds, and sorry, you can't. If you believe it you'll have to do so on faith with the comfort that it is consistent with a deterministic universe. I think it's silly, especially because belief in it discourages further thought on the subject. Why believe in something that has no other effect than to stifle curiosity?