It is indeed so much true that most people using spoilers aren't helping making the quests better. Ideally you should report every phrase you tried before you tried the spoiler. And since this is kind of testing phase, spoilers are even justified, because you can go on with the quest and have possibility to report other phrases, which didn't work before the flustration eat you alive. But then again, no full quests spoleirs, only one time separate phrases. If you are smart and can use full quest spoilers the same you would do with the one time ones and help devs same as good, then congratulations, but you are in the minority.
But as i see it, people aren't really reporting. Exactly the same way as you read wikipedia, but you don't contribute

I don't.
Although i really don't know how exactly the system with logging everything what players ask and NPCs don't understand works, but i'm of oppinion it should work better than players going to bug tracker and preparing whole bug report for a single thing, couple of phrases.
Although devs probably have the same amount of work, players don't have to do anything at all. Our time is precious too, everyone values their time.