I agree with all of this, but I do have a bit of pushback- The account creation process, with the steps of create, verify, provide username to host, wait for invite, accept invite, pin to sidebar is enough of a barrier that it stops some people. I have a handful of guest accounts already setup and sorted that I toss out to interested people, and if they find it useful only then do I have them jump through the hoops of creating their own account.