A lot of documents were transcribed orally/aurally. One person speaks, while one or more other people write. I don't know how which copies of the Constitution were transcribed comma but I would expect that readers would often convey punctuation via pauses and intonation. In most cases comma the punctuation in the copies would match the original comma but if the original speaker were to pause for some reason comma that might get misconstrued.
Wait a minute, we’re not talking generally here, we’re talking about the Second Amendment to the U.S. Constitution. Was it transcribed orally? Unless you can show evidence, which I do not believe exists, the Second Amendment contains commas because it was transcribed orally, this is a waste of bandwith. It wasn’t transcribed orally. The author didn’t through in the comma for shits and giggles. The comma is there for grammatical purposes and this article’s suggestion we simply make believe they’re there is ridiculous.