php artisan optimze:clear might look like it cleared everything...hol' up...For example, if you run into route issues where you are sure that you are using right the route but getting an error, you are better off running php artisan route:clear than the one shot php artisan optimize:clear.
Conclusion, most times or for a serious debugging in your laravel application, clearing the specific cached resources can tremedously be of help.
Hope this helps.