I believe there is no other way to produce a painting. After all, any product has to be worked out as a hand made prototype first. There is nothing wrong to it. But usually the prototype is not meant to be the end product, it is not even for sale. The fact that lithographs and serigraphs, which, unlike etchings, do not suffer from the printing process, are strictly limited, shows, that short supply is wanted for in the art market.
Nobody can change the world.
Things being as they are, they signal that there is a demand for unique works of art, and if a process such as printing or casting makes multiples copies possible, then artificial limitation keeps a sense of uniqueness. Due to traffic conditions, we cannot guarantee that offered works are still available. We will update our offers as soon as possible. Email is fast, but we all live in different time zones. Although extremely improbable, you might place an order for a unique work which has been sold.