Something I've seen in various martial arts training: people who have a strong kinesthetic sense of how to achieve things and avoid mistakes can be surprisingly bad at articulating what it is they are doing. There's probably an analogic phenomenon in reasoning and discourse. People who find that they are persuasive, or have the ability to get good grasp on a topic in a short time, may not be able to convey the techniques they are using to achieve these effects. As this sort of problem doesn't stop people from giving advice, I think it's a useful pre-filter to put on when reading or hearing advice: Ask yourself if you can restate what they're saying or pay attention to what they're physically doing to gain a concrete, object level sense of what they mean.