Fleeting Frames did some research that dual wielding weapons are significantly more effective than shield + weapon. Do you mind substantiating this claim?
Achktually
Dual wielding was shown to be marginally more effective and at the cost of ranged/dragon flame defense once the studies were replicated. The difference is statistically significant but not by a wide margin even in close combat. The latest studies I saw shown that dual wielding was not unpractical and the result exceeded expectations because they shown dual wielders actually beating shield wielders.
The problem of those studies by in large, is their methodology, because they pit one style against the other with the assumption than if a style can reliably beat another, it is considered superior in every other circumstance.
The conclusion those studies shown is, in the event you're fighting a shield wielder at close range, a dual wielding style will give you an additional edge (lol) but little more.
What I did at the time was to conduct a LD50 test on both dual wielders and shield wielders independently. The LD50 is far more reliable as a test when compared with simple pitting, because not only it tests both styles under the same conditions (whereas the pitting test do not, it tests both styles under opposite conditions) but also provides numbers to work with. If my memory is correct (that study can be replicated easily anyway) the difference was somewhere around 10 and 20%
Edit : That the same problem with tests conducted here. The tests shows that a higher tier gear wins against a lower tier at a rate of 60%-70% which could lead to conclude to a significant practical difference. Problem is, that result doesn't mean a lot in terms of practicality, because both gears are tested against each other and not under the same conditions. A gear can reliably win against another yet only translate in one goblin difference in the LD50 test, which is closer than the actual practical use those gears will have.
Just as an exemple to drive the point home : a bronze gear could win against a copper gear 70% of the time because it's stats are slightly inflated. Yet when pitted against goblins under battle conditions, the bronze armored dwarves could only show a very marginal survival rate increase compared to the copper geared dwarves. The result you get from pitting one against another doesn't lead to a number that allows you to have an idea of the effisciency of the two gears