From that article: "It is notoriously difficult to properly apply: in 1961, the Supreme Court of California ruled that it was not legal malpractice for an attorney to draft a will that inadvertently violated the rule." (Emph added)

Presumably California would look less kindly on someone saying to their lawyer, "I want to lock up this money forever", and the lawyer in response saying, "Yes, I will draft your will so that the money will only ever be spent in the manner you command."