Reasons?
The products made in China are of lower quality comparing to the same product from same company if made in USA, EU countries or Japan.
Many time, the "assembled in China" implied improper use of labor, environment pollution, intellectual property...
And the money I pay to them may end up in the Chinese government budget to be used for robbing South China Sea and maltreating our fishermen.
My audio friends and me rather prefer pay a premium for audio products that are not assembled in China.
i am Vietnamese, it's easier to buy "assembled in China" here.