Deadlift

I play path of damned difficulty and have just got the fifth party member. I feel like the biggest problem is lack of accuracy: every swing, ability or spell has a very high rate to miss or graze, and this often leads to a wipe or a knock out. Most of my characters have accuracy around 25-45, however I have seen mobs with all 4 defense at around 80ish, even with all buffs from food, rest and spells on it's very hard to actually carry out a strategy which relies on a certain hit rate of abilities. I think there must be a certain accuracy threshold that you have to reach, otherwise your team build won't be legit. If I get it right, perception is the main source of accuracy, so why isn't it the most important attribute for most classes? Why would a DPS need might if 1 out of 2 hits is missing? And I read an article saying perception is mainly for defense, why is that?