Outside of medical/pharma/auto/aerospace applications, we have observed that only the top 0.5% of Chinese, Vietnamese, and Indian manufacturers ensure product reliability without their customers requesting it.
There are two main reasons for this:
First, they might have never been exposed to it, and they don’t suffer from after-market complaints directly.
Second, showing that the design has weaknesses slows them down on the road to mass production (which is where they make money), so they prefer to skip all sorts of validations.
Then, the buyer may be surprised by customers complaining about partial or total failure. The buyer also may not be able to make the difference between quality and reliability issues.