When you only use the visualception modul for your tests and not tests from the codeception framework you have a lot of
$I->dontSeeVisualChanges('id', '#something');
After writing it the tenth time you ask for a configfile of ids and div container in a file you could read in.
I thing for some reasons it is easier to handle a configfile than write the dontSeeVisualChanges.
When you only use the visualception modul for your tests and not tests from the codeception framework you have a lot of
$I->dontSeeVisualChanges('id', '#something');
After writing it the tenth time you ask for a configfile of ids and div container in a file you could read in.
I thing for some reasons it is easier to handle a configfile than write the dontSeeVisualChanges.