I don't understand this change, it looks quite natural to me that a boolean parameter called "debug" enables debug stuff, IIUC on the standard edition you're going to move all this code to web/app_dev.php and also duplicate it to app/console too (in a special condition on the environment, not the debug mode...)?

Currently if a page doesn't show up in prod mode but is ok in dev mode (for whatever reason, prod cache dir not writable or anything else), I'd just switch the flag from false to true and expect the ghost to give me some tips, it wouldn't be possible anymore after this change, for any PHP / Symfony beginner it will become much more complicated to handle such situations.