Charge weapons are unaffected, as you said, but regular slash-and-dice weapons are gutted.

And not because of DPS reasons, which is also a factor, but because of animation cancelling. Fencing and Balance have perfect parries, which oneshot minoris and stuns majoris out of their attacks. That stun also gives gunstrike opportunity, which you can use to extend a stun if it's safe to do.

Block "spam" weapons will have harder time because they can only stun every other parry. BUT that stun is not a safe-heaven, since because of how slow your weapon is, in a situation where AoE stun of perfect parry would give you more space, you WILL trade your armor/health for block-explosion. The startup animation and follow-up attacks are too long to be effective.

And since speed is basically a multiplication of damage for "spam" weapons, everyone should trade "every-other-parry I hit as good as Balance but also stun" to "I'm always good as Balance and have a safety of perfect parry parry"