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Very few companies, if any, build every part in their vehicle. While sample testing by BMW I'm sure is done, they rely on their vendors to hold up their end that they are providing reliable parts. BMW does check each vehicle coming off of the line, but that is not a long-term test. So, until some end up in the customer's hands, a problem after the initial development period where they are long-term testing could go unnoticed until something comes up. Give them a break...BMW did not make the batteries.
Once the problem has been identified, it can take some time to develop a fix that is reliable, and then to actually implement it. You can hold BMW accountable for not maybe letting affected people the status, but sometimes, you cannot just pinpoint a schedule of when the investigation, test, and verification will be done. Frustrating to all involved including BMW and Samsung.
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