You are right that quality matters, which is why the Chinese producing cars of the same quality for 70% of the costs is such an existential threat to the German car industry.
Associating China with cheap products is a false way to look at things. They absolutely are capable of excellent engineering and manufacturing.
>I will never need to buy another.
What a bizarre statement. The only hard part of the sharpener is the blade. This blade needs to be made of the proper material and sharpened the right way, you will absolutely need to buy new blades at some point in time. You can buy them here: https://www.moebius-ruppert.com/produkt/standard-ersatzmesse... they are user replaceable. If you put them into a Chinese made one you get the exact same quality of sharpening.
Lastly, these are pencil sharpeners. Being the best in the world at pencil sharpeners is irrelevant. Germany needs its car industry and they need to catch up to the quality of the Chinese if they want to keep it.