I mean, it's right in your screenshot.

"Unjustified usage of vote dismiss is a punishable act"

There is nothing for you to be reimbursed with. You didn't complete the dungeon, you didn't get the tomes and have them taken away from you (unlike your WoW example wherein you HAD the items only to have them taken away, hence reimbursement).

Allowing people to claim rewards for content they didn't finish (for whatever reasons) won't stop the problem and in fact, our community will just find a way to exploit it in order to gain undeserved rewards. The only solution to this "problem" is to stop it from happening and getting those who abuse the feature, punished.

That being said, I've never seen this happen in the 5/6 years of playing this game, but I also don't get involved in nonsensical discussions and actually focus on the job at hand rather than spending 30 minutes in a dungeon prior to getting to a final boss.