That's a nice question, and yeah I also think that the crafting system is underestimated in the majority of MMORPG games.
We didn't fully discuss the crafting systems as it is a bit early but crafting legendary items would be a nice thing.
They would be very very hard to make like in GW2 for example, there you can craft the best weapons in the game, but it will take you months of grinding, you can also get it from drop but the drop chance is small as hell.
So that way the people will explore the world in order to find the mats and will want to level up crafting, and if you manage to craft legendary items you will get a lot of gold.
So yeah I like the idea of crafting your own legendary gear, but It must very very tough.