In Drupal 7, you can disable user pictures just by unchecking the appropriate box on the Config -> People screen.
How can I disable user pictures in Drupal 8? I see that the default D8 install adds an image field
/admin/config/people/accounts/fields, but I assume that it would be better to somehow disable this than just to delete it.
For now, I don't want user pictures to be shown or used in any way, unless I decide to re-enable them later.