[KineticLensman]

On the subject of sacrificial parts, approx. 25 years ago I bought a lawnmower from a well established UK brand (Atco). The original design included a clutch-like mechanism that would decouple the drive from the drum blades if they encountered a serious obstruction and jammed. In the model that I bought, however, the mechanism had been replaced with a sacrificial plastic cog that would simply break if the blades jammed. Even though I was careful, on average, it would break every two to three years. This was before easy 3D printing was available, and I had no choice but to order an OEM replacement. If Atco had sold packs of the cog I wouldn't have minded, but instead you had to buy an entire repair kit with several other parts that weren't needed. After the fourth time it died, I replaced the entire lawn mower with a non-Atco alternative.

I've come across sacrificial parts in other contexts where they make perfect sense (e.g. holding car body parts in place) but I really don't like them being used as an opportunity for manufacturers to increase their lifetime profit from a long-lived product.