There are some errors in that Facts and Fallacies article. The Playstion stuff is pointless since you can get S-video from ANY Playstion by simply buying the S-video cable. There is no need to get an RCA to S-video converter, just buy the cable. Why does he even talk about this?

Also differing cable lengths DOES have an effect, relative electrical signal delays and thus potentially out of phase signals, though whether this is something significant or not is debatable.

Like the speaker resistance answers, sometimes he reduces thing to too simplistic an answer thus missing out on explaining things that are important. i.e. you want to match pair lengths for wire but maybe not the lengths for back and front, you want to make sure that speakers don't have more rated resistance than the channel which drives them even if they are each not necessarily matched to each other.

Myths propagate because people don't know and when an 'expert' gives advice that perhaps makes fundamental assumptions about what people know rather than explicitly spelling out the considerations, they only continue to propagate. Even worse is advice that ignores or exposes a gap in knowledge to begin with (like the Playstation advice).