Being able to outline chords in a blues progression using Triads is what separates the good guitarists from the great ones, and will also probably land you more gigs. With a bit of music theory, you can learn to insert Triad chord shapes in place of standard barre chords you may default to in order to enhance the musical situation dramatically. Along those lines, if you have any desire to learn how to create your own guitar solos, relying on scales is not going to cut it. In fact, when people ask the question "How do I sound like I'm not just playing scales when I solo?" the answer is always the same: learn triads. Triads are chords, but they can be used as pivot points to allow you to identify particular chord tones over various progressions in order to amplify what makes each chord so special.