There's no problem here. Its working as intended. Its not the animation that register hit, its the AOE and the cast bar.

If you're still inside the AOE when the cast bar finish, i'll get hit. Otherwise it will be a super easy game because the animation of AOE move is super slow. You want to beat hard content, just learn and play better instead of making a thread and complaining about how the game doesnt work as you want.

The only issue i see is people want the fight easy, too many casual players think about getting relic weapon is a right and justice without paying hard work. When they're bad they'll make a thread and complain instead of more training and win the fight.

Please stop asking for an easier game.