Hey I was so stoked about the dual wielding fo meele weapons when I tested this in the alpha test.
Now I was experimenting a bit but after testing different combinations all of them do not feel like the approach really works great.
E.g. when you equip a dagger and a longsword you can of course try to weave the quicker dagger hits into some longsword action but if I would use a shield and simply use the technique of the longsword I would make the same damage if not more and would be much better protected. There is no real added value here except when you get to the stage of comibining maybe different enchantments and poising or so. But this might rather be added value in the late stages of the game and until then it just does not feel rewarding.
From my experience in martial Arts dual wielding should fit into a niche between wielding a longsword e.g. in 2h and a sword and shield.
Less defense than having a shield but also more damage and counter attacks or riposte, in generall more technicall variety.
While wielding a longsword with 2h for example comes with even higher dmg per hit but at the expense of limiting defensive capabilties further.
Maybe for some inspiration here is a video that showcases how the combination of a longsword and shortsword work in Japanese Matrial arts. But this is also translatable toward Rapier and dagger etc. in HEMA.