On the "Site information" configuration page (/admin/config/system/site-information), the help text for the "Default front page" field reads "Optionally, specify a relative URL to display as the front page. Leave blank to display the default front page." The default value for the field is /node.
If the field is left blank, instead of defaulting to /node, users see the contents of the /user page when they try to access the site front page; their own user page if they are logged in, the log in page if they're not.
Tested on two sites running Drupal 8.0.5, one a freshly created Pantheon site, the other tested in two non-Pantheon hosting environments.
Comments
Comment #2
jackalope commentedComment #3
cilefen commentedAs you said, this could be a duplicate of #2671174: Make default front page setting required and remove special case of /user/login but let's see.
Comment #5
pameeela commentedClosing this as a duplicate since #2671174: Make default front page setting required and remove special case of /user/login was created first. Will add credit for jackalope there.