This is generally true, volume and low cost situations exacerbate it, but it’s not limited to Chinese manufacturing. You see it everywhere. As a completely unrelated example: home remodeling. The guy I contracted did wonderful work and charged a completely fair price, but there were many parts that I hand waved at “he knows best” “he’ll pick the most sensible approach that matches the quality of the rest of project”. Wrong. Cheapest, fastest thing, using materials on hand if possible every time. The economics are obvious and it doesn’t matter to him insofar as I acquiesce or don’t notice. Why should it be any different for low cost mass manufacturing?