Comment by kevincox

This does mitigate the benefit. But it still provides solid ground for a trustworthy manufacture to step in and break the trend.

Right now if a trustworthy manufacture kept the same hardware for an extended period of time they would not be noticed, and no one could easily tell. Because many manufacturers are swapping components with the same model number it is poisoning the well for everyone. If the law forced model number changes then you could see that there are 20 good reviews for this exact model number and all of the other drives only have reviews for different model numbers. All of a sudden that constant model number is a valuable differentiator for a careful consumer.