To make your voice heard.
And regardless of what you assert, or anyone else who's complained that the HC team ignores feedback, the fact that Windbag21, who is the worst tester in history, who doesn't even know how to test, who can't make a feedback post without demanding that everything in beta be scrapped and his 742 item wishlist be implemented yesterday, gets developer responses... that's undeniable proof that they're listening.
Test. Assess. Speak. They're listening. That does not mean they'll change everything, or anything, but the fewer people who participate, the fewer voices there are to listen to and the more control those voices have.
Communication is power. Use yours.