In the new Heart's Day quest, "Heartsick Follies," you are tasked with killing a delve boss. A specific delve boss. The same specific delve boss that
everyone else doing the quest has to kill. A normal delve boss, with normal delve boss health, with a crowd of players waiting for it to pop so a couple of them can melt it in under a second while anyone who wasn't ready in that split second (or constantly spamming AOEs) misses out and has to wait even longer.
@ZOS_Kevin, I realize it is unlikely to happen before the end of this 1-week event, but could you pass a suggestion to the team to allow
any delve boss kill to satisfy this mission requirement for future years? The quest dialog makes no mention of this delve/boss specifically (only the quest objective), so there is no story-related reason to limit it. Opening it up to any delve boss would allow players to spread the load around to the delve of their choosing so there are fewer players competing for the same kill.