I believe when this has been brought up in the past they have said that is easier said than done. It's the reason they added maps and talismans to Vela in Cove and to BoD rewards.
At least to my opinion, both the rewards from Vela in Cove and the Cauldrons from the BoD Rewards take way too much time for the actual bonus that those Rewards give to make them usefull, at least for me.
The Vera Caludrons of Transmutation has a ratio to 3 to 1 and, since there is a weight limit of how many ingots one can hold in one's own backpack, the end result is quite limited, to my opinion, for the hundreds of Void Pool points that the Cauldrons cost to get.
The Vera Maps ? They might be of use to an afk scripter who can set a BOT to script mine all of the 24 hours that the Map is valid for, but if a player has limited time, that the Map is in theory valid for 24 hours helps little when that player, for example, can only play 1 hour during those 24 hours of the validity of the Map...
Different would it be, if the Map was valid for 24 "logged in" hours... then, the player would set a character to mine, give him/her the Vera Map and use it for all of those 24 "logged in" hours....
As in regards the Smelter's Talisman the weight issue of how much ore one can carry in the main backpack limits very much, to my viewing, its usefullness.... even if it smelts 100% of the ore, how much ore one can carry in one's own backpack ? A Large pile of Ore which yields only 2 ingots weights 12 stones... so, if the carrying CAP for weight of a human character is 523 stones (
https://uo.stratics.com/content/misc/weight.shtml), that means that at most, a human miner can carry 43 Large Piles of Ore to smelt using the Smelter's Talisman which will yield only 86 ingots.... at the cost of 1 charge of the Talisman which took hundreds of Void Pool points to get....
The BoDs Cauldrons which also convert resources at a 3 to 1 ratio have the same issue of the weight limit that a character can hold in the main backpack thus resulting in little quantity been converted and they must be used within 24 hours from claiming them and once started must be used within 4 hours... they do not have charges, though, I think, which is a good thing...
Also, all of these convertion tools only start to work from bronze into gold... if a player needs to convert into Dull Copper, Shadow Iron, Copper or Bronze, there is no tool to convert into these other types, that I know of.
For example, during the Tokuno Event I have been using lots and lots of Shadow ingots to make Dragon Barding for my Warrior's mount (750 ingots per armor) and they break way, buy waaaay too fast.... I have been burning during this Event tens upon tens of thousands of Shadow ingots (I think I might be close to 40k-50k Shadow ingots having been burned into Dragon Barding Armor although, I did not want to take note of how many I used up on purpose not to feel bad for seeing so many of them going away....) and it has become an issue to get them.... frankly, either 750 ingots to craft 1 single Dragon Barding armor is too many ingots, or the Dragon Barding Armor breaks way too fast.... a tool to convert Iron into Dull Copper, and Dull Copper into Shadow ingots would come helpfull....