I think the way ore vs. rare ore nodes spawn could use a little rework. Seems a little incoherent, and I love coherency.
All ore nodes should share a spawn with their rare ore counterpart, with the normal ore having a chance to spawn as a rare ore node.
For example, all azurium nodes have a chance to spawn as platinum, rather than azurium and platinum having separate nodes.
I think the weight should be about 75% normal, 25% rare, but could be adjusted as needed.
My thinking is that normal ore is primarily used by one profession (blacksmithing), and the recipes generally take 4-8 bars.
Rare ore is primarily used in one profession (jewelcrafting) and the recipes take 1-2 bars.
The number of professions that primarily use those ores are the same, so same "weight" as far as how much the playerbase needs them.
Jewelcrafting recipes take 25% of the bars that blacksmithing does, so the "weight" is about 1/4th of what blacksmithing needs.
In theory, this would be about right as far as providing the ore that players need for both blacksmithing and jewelcrafting, as well as the few bars needed for other professions' crafts. Making all tier 4 nodes have a chance to spawn as either their normal or rare ore variant also makes gathering ore a more organic experience. Players wouldn't need to find one location for azurium, then another location for platinum, for instance. The node spawn chances would apply to all tiers of ore.
Lastly (and tangentially), I'm sure it has been brought up before, but the primary way to acquire gems for jewelcrafting is buying them from merchants. Doesn't feel great. If there were some way to prospect ore and receive gems, it would also make that profession a more organic experience. Through some manner (maybe the jewelcrafting bench? Blacksmithing bench is already pretty well used), ore could be destroyed and gems received based on the tier and rarity of the ore.
The tier of gem received would correlate to the tier of ore and the tier of jewelcrafting it is used in, and the chance to receive a gem would be weighted more highly for rare ore than normal ore.
Back to azurium and platinum as examples:
Azurium could be prospected with a chance to receive a gem. Because it is normal ore, the chances would be low. Because it is tier 4, and the jewelcrafting recipes that use it require either plain or brilliant gems, you have a high chance to receive a rough gem, a normal chance to receive a plain gem, and a low chance to receive a brilliant gem.
Prospecting platinum ore would have a higher chance to receive a gem and better chances to receive a plain or brilliant gem.
I feel like these changes would have a positive impact on these gathering and crafting professions (especially jewelcrafting).