{{#user_loggedin}} helper

What about this user_loggedin helper?

    {{!-- Contents for logged in user .... --}}

I think this will be too much helpful for theme developers.

This isn’t possible because of the way the admin interface is designed. There is no tight integration between the admin panel and your Ghost instance; anything that can be done in the admin panel can be done over the Ghost API because the admin panel uses the API in the background. Adding a helper like this would be nontrivial and add a decent amount of overhead to all ghost instances

I already answered you about this here: Check user is logged in or not - #2 by Rubel