Is this good practice? I have pointed my config sync to:
$config_directories['sync'] = 'profiles/PROFILENAME/config/install';
drush cex have worked, allowing a cycle of UI changes, config export, and re-installation with the new changes.
We will not be going live with D8 for a while, so the team's plan is to use this method to gain familiarity with the config system and other parts of D8 using this simple method.