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One of the symptoms of an approaching nervous breakdown is the belief that one's work is terribly important
Random parry or weighted parry strats should be a huge fucking pain in the ass if executed properly. I've never seen one done properly, but statistics alone denotes that you could probably write something that would realistically achieve a 20% minimum proc rate, meaning you'd take that much longer to prep.And the things you could do with automated parrying on a Blademaster nowadays.. Augment is so ridiculously dumb.
Better than that, really, since people aren't generally trying to prep all four limbs, plus torso. If you know they're going for just legs + torso, for example, you can random pick between those and have a 33% chance of parrying the correct body part at any given time.
I don't think automated parry is bad. Just don't pick the most predictable parry strat (last body part hit). Random parry, static parry, and semi-random parry can all be good. I also liked doing a combination of last hit and opposite last hit (do one strat for a bit, switch to the other once the enemy catches on). It will take more time for them to figure you out then, and you will get a lot of parries. This can all be automated.