Craftsmanship - the Fifth Agile Manifesto Value?

Robert "Uncle Bob" Martin re-invigorated the discussion around "professionalism in programming" by proposing that the Agile Manifesto be updated with a fifth value, "Craftsmanship over Execution".

At his Agile 2008 keynote in Toronto, "Uncle Bob" came forth with a proposal that the Manifesto is due for a fifth value: "Craftsmanship over Crap". As he explained, the value signifies that it is more important to pay attention to good craftsmanship in software development, most notably when writing code, than it is simply to crank out working, but "crappy", code.

A week later Bob took the opportunity to clarify his intention, revising the new value he had put forth in Toronto:

The problem with my proposal is that it is not a balanced value statement. In the other four statements we value the second item. We just value the first item more. But in my proposed addition, we simply don’t value crap at all.

So I hereby change my original proposal, which was made for dramatic effect, to:

• Craftsmanship over Execution

Most software development teams execute, but they don’t take care. We value execution, but we value craftsmanship more.

Many people have spoken up in response to Bob's posting, proposing their own revisions to the original devalued item "crap". Among these responses were: ["Craftsmanship over..."] Heroics, Production, Engineering, Hacking, Brinkmanship, Efficiency, Quantity, Toil, Yield, and even Scrabble.

Not long ago, Brian Marick made similar suggestions that agile teams should value, in addition the current inclusions of the Manifesto, Skill, Discipline, Ease, and Joy. For many years, Pete McBreen has been using the term "craftsmanship" to emphasize the importance of people's skills when it comes to software development. Sean Hanly spoke of "Quality over quantity" and how agile can support "Craftsmanship" in his article Zen and the art of software development. Over the years, many have made similar statements in one form or another about the essentiality of recognizing "software as a craft".

In short, the idea that agile software development place an increased attention to "professionalism as a programmer" is not an entirely new one; XP comes with a long list of technical practices purposed purely at this goal, Scrum emphasizes attention to "technical excellence", and the list goes on. The question: why does it seem so many teams don't necessarily achieve this? Is this too implicit? Would adding a fifth Manifesto value help make this a reality? Would it hurt? Speak up and share your thoughts on the subject.