I was under the impression that the 18th amendment was desired, not required. After all, President Jefferson and his Secretary of State James Madison (who wrote the Commerce Clause), used the power of the Commerce Clause to prohibit alcohol sales to the Indian tribes in 1802.
Maybe these two Founding Fathers were confused about their power to regulate commerce, huh?
Don't be an idiot.
Also, you are still confused about the term "regulating" and the term "prohibiting". One allows action while the other stops it. Until you understand the difference, STFU.