In MO1, most materials were just straight up useless in crafting when their real life versions should be decent at making weapons and armor. Things like bron (bronze) and pig iron (iron) were used as weapon and armor material. Why they were so bad in MO1 I don't know but in MO2 these kinds of materials should be buffed.. a lot. Like, it makes no sense that metals like cuprum are better weapon material than bronze or iron.
One more suggestion is that leathers and scales obtained from animal butchery should be processed before used. Since metals have to be refined, why don't leathers and scales need to be tanned? The same should go for silk and ironsilk. They both need to be spun on a loom of some sort to be useable. Otherwise, it makes no sense for there to have so many steps to process ore into metals but you get instant access to these leathers and textiles just from butchery.
One more suggestion is that leathers and scales obtained from animal butchery should be processed before used. Since metals have to be refined, why don't leathers and scales need to be tanned? The same should go for silk and ironsilk. They both need to be spun on a loom of some sort to be useable. Otherwise, it makes no sense for there to have so many steps to process ore into metals but you get instant access to these leathers and textiles just from butchery.