> If your kitchen knife kept changing shape, weight, and edge, you’d have to relearn it every time; that’s a hard tool to build trust in. On the other hand, if

> If your kitchen knife kept changing shape, weight, and edge, you’d have to relearn it every time; that’s a hard tool to build trust in. On the other hand, if you hire a cook, then all you need to know is English (or whatever language they speak). Even if the cooks keep changing, you can always just tell them "use the knife"