The primary thing when you take a sword in your hands is your intention to cut the enemy, whatever the means. Whenever you parry, hit, spring, strike or touch the enemy’s cutting sword, you must cut the enemy in the same movement. It is essential to attain this. If you think only of hitting, springing, striking or touching the enemy, you will not be able actually to cut him.
The McNamara fallacy, named for Robert McNamara, the US Secretary of Defense from 1961 to 1968, involves making a decision based solely on quantitative observations (or metrics) and ignoring all others. The reason given is often that these other observations cannot be proven.
The fallacy refers to McNamara's belief as to what led the United States to defeat in the Vietnam War—specifically, his quantification of success in the war (e.g., in terms of enemy body count), ignoring other variables.
The decreasingly tangible product of code, i.e. that all we have are files on a hard-drive, may make it easy to forget that writing software produces a thing. If you produce a wonky chair or an overly long fork, it’s easy to see the quality of work was not great. By calling for a perception of software as a craft, we fight against that ability to forget or not notice the final quality of the product. You could watch two software engineers with different levels of experience, or in different domains, and it wouldn’t necessarily be so easy to guess which is which, at least from a distance.
So maybe there is something to be said for the value of software as a craft, for sometimes focusing on the practice of making better, or at least different, software just for the sake of it.