It's not clear to me if this module can be used to update existing configuration objects, rather than installing new config objects for a module that's already been installed.
For example,
$config_importer = \Drupal::service('config_import.importer');
$dir = drupal_get_path('module', 'my_module') . '/config/install';
$config_importer->setDirectory($dir);
$config_importer->import(['core.entity_view_mode.media.testing']);
Does this work if the config object core.entity_view_mode.media.testing already exists and you just want to update it? I'm confused how that would work because you'd be overwriting the existing config object with one that doesn't have a config hash. Drupal uses that config hash to determine if a config object is being updated or if it's new.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
This is still an open question that would be great to answer on the project page also. Thanks!
Sadly seems like it isn't. This was also my hope, as I just needed to import some new config files from config/install in a module. My expectation was that only these were imported and updated, but instead a lot of existing configuration was deleted.