The question is, does that prevent something worse from breaking? It's not inherently bad to have wear parts in a device, after all. Shear pins are a great example where you need to replace them, but something more important would break if it wasn't the shear pin, so it's worth it.
IDK the design of the mixers well enough to know if that's true for them, but I do wonder if that is the case.
> The question is, does that prevent something worse from breaking?
That is the stated justification, yes. However, in practice pre-1970s models will happily knead bread dough for years on end, and more recent models tend to explode within the first few times you attempt to make a loaf of bread (leading home bread makers to have to spend more on an expensive commercial model...)
> The question is, does that prevent something worse from breaking?
That doesn't matter if it means, for example, that my new mixer can't actually mix bread dough on a higher speed anymore (citing this as it's actually a failure mode on newer (like 1970s forward) KitchenAid mixers to the point that the manual mentions it).
That is an objective decrease in quality and fitness for purpose.
IDK the design of the mixers well enough to know if that's true for them, but I do wonder if that is the case.