I made a couple of these doodles, so to ramble a bit more

Sundering and Merging is not only a process of extracting metals from ores, squishing them into crude uneven plates, but it can also be used in a more complicated way to alloy metals together. Meaning that, while smelting and casting is more scalable and versatile, you don't need to do that to make bronze, brass, or any other alloy that a drek or orm may want. Also the plates naturally make wonderful trade ingots. They can be given off to someone and whether they cut/break pieces off to hammer into tools, or melt down and pour into a mold, either way the plates are a good medium for transporting the metals.

Aluminum is an important one as, while otherwise not realistic for societies in the dragonscape to make in the first 10,000 years without sundering, with resonant sundering as a refining method aluminum becomes a highly abundant, cheap metal. Be it hammered or casted it is a great material for all sorts of pots, pans, forks, cups, bowls, skillets, and other wares. Its also a lovely choice for jewelry! Or to alloy in with copper to make aluminum bronze. Of course Aluminum and Aluminum bronze were already being made from scavenged metals in the ruined cities of the Americas, known as Suyu. But this provides a method of making aluminum without relying on prepulse human ruins.

So on the plana of Logáu, here we see a trader and a caravan guard departing from the Protocity of Aguk to pedal metals to lowland tribes in the West and East ends of the Great Spine in exchange for valuables like Metefi silk, slatewood, latex, gemstomes, and Doríat clay. Though due to the very very practical value of these metals, and the fact that the traders aren't willing to just hand them out for free, banditry can be a problem. So in Aguk there are many mercenary dens who sell their services to these far flung merchants, protecting them while they travel to get luxuries from the fringes of the continent. Violence isn't a guarantee, but should bandits come, these guards are often willing and very able to spill blood in order to protect their pay to feed their own dens.

Even with metal being widespread in central logáu, much like other planar, a good general rule of thumb is that its still valuable and hard to get at scale. You don't usually see metal get past things like tools, jewelry, and weapons. So Armor is rarely metal, but other materials like bone, chitin, hides, and wood are used for armor instead. The brass dagger is specifically thanks to resonant sundering improving access to Zinc as an alloy metal.