The old user pages showed if a user was unregistered, but I haven't been able to find that note on any users with the new page. Now it's possible that no one is using the sites I've been checking without registering fully, but it seems unlikely - I've checked a lot of 1 rep users!
This was a useful piece of information to have, as it gave a strong indication as to whether a user would even return. This is helpful for considering whether to spend more effort to improve questions or just to close them, for example.
If it's missing, can it be added back?