I don't see why minting coins would require any different skill from crafting a figurine. It's probably even simpler since you can mass produce them with a mold.
Coins aren't molded, they are punched, pressed or stamped(whichever you would call it).
Bumber's point is still valid. Coins are fairly easy to mass produce.
A coin with no fine inscription, date or anything is worthless in common currency as it is to bartering the percieved value of blank metal pieces.
Metalworkers also cover a wide range of objects so freeing them up from coins would allow
economic coin minting specialists to immigrate and set to work upon creating a stable economy for a fortress rather than tasking smithies present in normally every metal-bearing settlement to be begrudged with the distracting task.
Like i mentioned a seperate level of expertise besides creativity & pure kinesthetic sense is required, a high degree of intelligence simillar to bookeepers and doctors in order to regulate and keep in check all the currency produced so it is in high quality & correct quantities. In itself while you can remark that coins are easy to mass produce, in 1400 terms with no mass printing, each coin would need to be either exact and to a high level of precision to ensure that they are legal to use and not counterfiet before mechanisation that came much much later.
Each coin would need to be cut, weighed, and pressed all by hand with the fault lying at the crafter this 14th century reproduction of the Tower of London's mint show's.
"More skills" seems to be the direction that DF is taking. Like with "fighter" vs "swordsdwarf" skills, I imagine that both will matter for the task at hand, and both will gain experience from crafting coins.
I don't see why knowledge of the specifics of creating coins would make one qualified to write about The Economy, though. Maybe a lifetime of minting would reflect or bolster an interest in money, and thus also economics, but the two skills aren't really related.
That's fair, but animal tamers, trappers & ambushers get the same advantages to talking about the field of natural science without actually partaking in that field only from a abstract point of view. There are a large amount of side practices such as the deliberately witholding and debasing currency that can affect a minter's livelyhood and hence gain a grasp of it, as well as important political figures such as economic counsel's to monarchs who usually are in direct charge of both running the Mint & managing the workers there directly invovled.
Easy reproduction of money today where there is a lot more wealth spread across all social divides (still not a lot in few places) is very much under appreciated when in the time setting of DF most of it was circulated both as political status & in the highest circles of society virtually exclusively without considerable links to aristocracy and lucrative trade crafts such as being a merchant or a in-demand business owner for vital goods like salt (preservative), leather & metal or owning land of some sort.