Yes, that is dual daggers build. Daggers have been noted to be very strong precisely because they hit twice quickly. Slower weapons (2 - hand) do not get nearly as much benefit, even with agility rings. The one handed swords are the same thing. If something hits multiple times quickly, it will benefit much more than slower weapons in this area.
but isn’t that exactly how it should be? synergies like that with daggers or any fast weapon and on hit passives make these builds strong, while other builds profit from other passives or strategies, like heavy 2-hand for poise breaks and more damage when the enemy is exhausted.
or lets say focus on kill. make a mage build that 1shots mobs with rune attacks and instantly refills your focus.
but we are straying away from the topic. 
I do agree we are straying from the topic. I do see you point about stagger damage. However, as I have made a point in this game and others, one of the fun builds in any ARPG is HP/Power/focus gain. They nerfed that option for 2 handers. Before the nerf, it could be accomplished better. Finding a balance for that would be great. To argue that only fast weapons should benefit better from this area of fun is not really valid; it just is pushed to say you have other options for those weapon types (2-hand). While this is true, I still believe that regardless of the weapon choice, the HP/Focus gain should be viable. As it stands now, as a result of the nerfs, the only viable option is daggers or a very fast sword, which one hander swords are not very fast, unless you stack the agility rings currently. Or let’s say like the needle spear because of I believe its focus or hold attack that hits multiple times. I have run a stagger build (currently using the unique that gives plus 3 stagger). While it is great and does stagger, lacking the HP gain in the crucible really forces one to use the food mechanic heavily. With the current refresh rate on food use, this is very far less than a good choice, as food takes between 15 to 18 seconds to use again.
I personally don’t like the weight modifiers on items (both with Affixes as well as Base Stat variety). Which enables you to wear plate without adequate investment.
The idea about tying offensive Affixes more to Cloth/Leather and Defense more to Mesh/Plate is pretty great.
Would pretty decisively ensure, that you have to sacrifice offense for defense.
I also think DR could use a mix of % based and flat calculation.
→ Plate is best vs really heavy hits (that could be dodged), and even upgraded cloth works well vs smaller hits