QUOTE(Sapo84 @ Aug 2 2018, 06:23)

Because you're comparing DW with 1H?
1H has way higher survivability by default since it stuns enemies.
I've never really done any math on that but I wouldn't be surprised if the stuns nearly halve the damage received.
Haha, I forgot about the stun too - yeah, that's a huge difference in survivability. DW does have higher attack speed which helps (and in FRD builds or club mainhand there is also some stun), but definitely the stun on block/parry is most of the difference in the builds.
QUOTE(monkey_lmf @ Aug 2 2018, 03:58)

Can you please explain where the numbers in the formula come from? Too dumb to understand x.x
I just made the assumption that against physical attacks block and parry are pretty much equivalent (I think there is a bit of difference such as overpower vs precision upgrades in monster lab), and so anythings that goes through evade will be block, parried, or hit assuming the monster doesn't miss with a physical attack. In that case, having a 50% block means that half of what is not parried will be blocked (I think block is considered before parry, but a x b = b x a so it is equivalent). Therefore, ignoring overpower, 46% (100%-54% parry) of physical attacks not evaded will be blockable, of which half will be blocked (ignoring precision), leaving 23% going through both block and parry. This is equivalent to 0% block and 77% parry (again, ignoring overpower).
But as sapo pointed out, the biggest diff is probably stun, so the above isn't the whole (or even most of the) picture. In any case, it certainly means that even against physical attacks which parry is designed against, 88% parry is not as big a difference compared to 54% parry and 50% block.