Maybe it shouldn’t be. I only play PVP during Guild Wars weeks, because otherwise I’m constantly getting matched with “meta” teams (which isn’t a problem per se but it’s nonetheless frustrating). And like everyone else says, if this is a game mode you DON’T engage in then you are either completely blocked in Campaign progression, or looking at a major Gem sink to skip the task.
Except on Switch, the 6.9 update left us with a mismatch between the task description and the task itself.