It was one or two months ago when I reached the level to unlock the world quest for using badges and medals. But the difficulty of the battles were not only challenging, they were impossible at that level. Worse yet, they blocked the line of world quests behind them. When I eventually was able to win the battles several dozens of levels later, the other world quests down the line were much easier than these ones. It seems that something is amiss: did they switched the unlock sequence around without adjusting enemy levels?
… you might want to NOT participate in any of the topics discussing the 6.9 update, then. Because basically everything that got changed is (currently) a net negative.
Why this particular World Quest is a problem is because (1) it unlocks WAY too early for the teams you’re supposed to fight, and (2) you cannot back out of one World Quest to select another (the way you can with Kingdom Quests, Faction Quests, heck even World Event battles).
From a game design / game flow point of view, world quests are not supposed to be too difficult. They are early game (introductory) basic content, not end game challenges. It does not make sense to gate early game basic content behind a very difficult battle.