Okay but people don’t owe you their effort. I can and should be able to drop a key on a whim if I feel like it, with or without explanation. That’s how every other part of the game works. Nowhere else in this game do you get in account trouble for leaving a group.
Does it suck when someone “bricks” your key? Yeah it does it’s happened to me plenty of times. That person doesn’t owe me a damn thing.
Again, Blizzard owes a definition of what is or is not a good reason for leaving a key. I can guess what they mean, and I’m assuming I’m far away from anything they might take action on, but a definition of griefing is more than a reasonable thing to ask for, because I am sure plenty of people have thought I bricked/griefed their key when we had 15 deaths before the first boss.