I'm thinging that it isn't so much where the scope is made anymore but rather the QC that it is held to. Also, they make components all over the globe and assemble them in yet another spot. Kinda like these "made in America" cars.
Anytime you move moving parts there is a certain amount of wear. The way to avoid this in a scope is to use fixed power scopes. We buy a 3x9 and then carry it set on one power 99% of the time and only use 9x when we sight it in. But then, I have some vintage Weaver 1.5x5 scopes that are @ 40+ years old that are still bright and tight.