The Authenticator as a "you must log in to see this" pattern is a left-over from web2 and a previous iteration of the w3 apis.
Everything we are building allows participants to do things locally without registering. We currently require people to register an email address to associate with a space, but this is changing as we iterate on the specs
For example, we could remove the authenticator step from w3console and the app would let you make spaces as it does now. No need to prove anything to the website before you start using it.