Agreed, a key pair is certainly better than having to provide an email address in order to create an account.

But it's not complete anonymity if you always use that key pair and with the same relays. In addition to using the same lightning address. In addition to any further identifiable information provided through profile data.

The relays will still see your connecting IP, user agent, etc. But this is what #Anonostr seeks to solve is to disconnect that trail you leave behind.

By using a new key pair for every note, and eventually through relay hopping, it will make it nearly impossible for someone to try and track and/or link all of the npubs together or from one particular relay.