There is a difference between "scrutiny" and fanboys defending a game's faults which would be pointed out by people without a personal investment.
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Your idea of a one way suggestion box would blow even harder because there would be no way for anyone on the outside to gauge the interest in one idea or another. It would all be hidden in a database somewhere, tracking how many people have submitted an idea. It's a crude and poor way to process feedback. Never mind the fact that someone has to look at each and every comment.
The reasoning behind most of my responses to things like this is more to do with the amount of time it will actually take for the individual with a problem to actually have this idea see the light of day. Ideas need to be properly formed here or where ever and show a reasonable amount of support before they even get considered by the team. Some things are easier to get through to the team than others.
In the case of getting a piece of loot from an alliance raid or dungeon, the intent is for the players to run this content multiple times. You're not here to run something once or twice and be on your way. You don't have to work there to know this is truth. It's how these games have operated for decades.
So, it could be months before a change can be considered and then implemented. If you want to sit and wait, that's up to you. You can also do what everyone else in every game does and just go for what you want. It will drop at some point.
By the way, the biggest obstacle to feedback is not the alleged fanboys or so-called echo chamber, but the people that can't handle any kind of real discussion on a topic, as well as those that post the most ridiculous threads pushing good ideas further away from the front page. I remember discussing ways to get loot from places we've cleared. I was in favor of it if it's at least an expansion behind, but then that keeps people out of that content. There's less incentive to run it.