Time played ie participation goes down when people quit. They didn’t consider that originally, because they figured everybody was too addicted to leave.
It’s the same thing for the raid vault. I sure do love spending entire weekends getting gear for complete random people I will never see again while wiping for 4 hours on Anduin to get nothing only for the vault on reset to give me duplicates.
I refuse to believe any devs play this game anymore and only care about metrics to appease shareholders.