There are a lot of classes which can get 90% or more overall PDR without spending anything.
30% (Leafre Set) + 20% (Light Wash 3) + 30% (Aria Armor/Battle Rage/what have you) + 10% (Max Ambition)
Even if you have only Light Wash 2 (which is reasonable to get, unlike 3) and level 0 Ambition, that's still a respectable 75%. And there are a lot of skills that have defense ignore tacked on to them as well, so it wouldn't be unreasonable to assume that a level 170 Marksman ignores 100% of the defense of a boss.
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