What security risk is not having "default" theme?

Question

I always develop my own templates and remove the 22, 21 and 20 templates as well as "Hallo Doly" and the superfluous pages and posts.

After that a warning is displayed under site health 'Have a default theme available'. I have no use for these templates but how do I rid the site of the warning?

Answer 1

In case you wanted to try - here is the code snippet to add to wp-config.php

define('WP_DEFAULT_THEME', 'theme-folder-name');
define('CORE_UPGRADE_SKIP_NEW_BUNDLED', true);