The problem is that we're dealing with the hypotheticals of a future site and for any answer I give you on a hypothetical it's infinitely possible for you to come back with, "yeah, but what if..." that doesn't quite fit the rule. If you're not sure how something fits into the culture, observe the culture more. Try to figure out why people do what they do and don't worry too much about defining actions for every possible future. Do what you feel is right and if you have a community that agrees, they can follow with you. I was trying to avoid saying it but, and damnit kleinbl00, lurk moar.
Well, we'd have to look at the established pattern of what we've already seen. I don't know what that is because while I've apparently had an account for two years I haven't been using it nearly that long. Has there been an issue so far at all with things like block lists or groups fragmenting?