Meh stonedwolf , you dont understand 2h Geisenda at all.
I got a message you'd made a direct response to me. I made the decision to momentarily take you off Ignore. You need to work on your people skills.
Though I like playing her from an PRG perspective, I understand 2H Griss is strictly inferior in every meaningful calculus to Agility Griss. Relying on one hit in ten to save your skin is not
optimal. You can muddle-through suboptimally but it's not optimal. Little wonder your 2H Griss is forever picking herself up off the floor having been smashed to bits even with Body Development. I'd be Furious with that Specification too.
Let's look at the data. As you say, maxed Precision Strikes Greatsword gets 10% Critical hits; with a Light weapon its around 17%. Now let's look at Weapon Speed, many Light weapons are 34% faster than Greatswords (though Magma Dagger and Shadow Blade, each impressive weapons, are 45%, but lets put those to the side, they're not most). Now let us consider 100 seconds of combat, that's enough of a timeframe for us to see how the averages average-out. The majority of great Greatswords (all the ones that get most use) have Speed 9 which is 9 attacks every 20 seconds, for 45 attacks per 100 seconds; of these 10% will be Critical. The Light weapons (be they Dagger or Shortsword) are Speed 12, for 12 attacks per 20 seconds, or 60 per 100 seconds; of those 17% of those will be Critical.
To summarise: every 100 seconds Griss gets 4.5 Criticals with a Greatsword, in the same time she gets
over TEN Criticals with Light weapons. So she's around 130% more likely to Critical with a Light weapon than 2H. (Weapon Speed also means Heavyhand III for +5 damage on a Greatsword is
equivalent to 6.7 damage on a Light weapon).
As you note Griss doesn't get many Skill points. By definition, 2H Griss costs 6 more points just to get to a baseline than Agility Griss. To make a 2H Griss literally takes 6 skill points away from a different Skill. AND it costs you armour, both direct from Agility AND from a Shield, and the longer you stay upright the longer you can dish out the damage.
If you want visual fun and RPG flavour, fill your boots.
DPS Griss is Light Griss.
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EDIT #1: there is an argument to be made for single piece of large damage overcoming high armor values, particularly on the (relatively few) enemies with Shields. That's true. But that's also balanced by Elemental damage which bypasses armor, because Light weapons hit more often that Elemental damage gets through more often.
On average +5 Elemental Greatsword damage becomes +6.7 on Light weapons, just as
on average the +5 Heavyhand becomes +6.7; but
situationally it's a
second trigger of +5, so if you're getting another hit in before the enemy hits, it can be enough of a difference to kill, and thus you get no damage from the return hit - destroyed enemies don't hit back. And we should not forget that
full Elemental damage gets through the Cleave.
EDIT #2: I admit these stats do not take into account the 10% Stun chance from 2H Expert. I admit that's great. A two-second stun provides, on average, 0.9 attacks from a Greatsword. Not-quite-but-almost one full free hit per 10 hits.
EDIT #3: does this mean player Warriors should be Light? They
can be. 2H, Hand, and Light Warriors can all be built to be killers. But players get more Skill points than Companions, also Charge and Whirlwind, and maximised one can back-and-forth between them using player skill to use them optimally in ways the AI will not. But player Light Warriors are nothing to sniff at either, they also get Duel and Flurry in addition to Criticals and Heavyhand and armor. (And of course Hand players get the mighty Infantry Training, so all three have something Unique for their build).