It's unfair to blame SMART stats for this. On their own, SMART does not declare a drive 'healthy' or 'unhealthy', it's up to the user to decide. Each stat on it

It's unfair to blame SMART stats for this. On their own, SMART does not declare a drive 'healthy' or 'unhealthy', it's up to the user to decide. Each stat on its own seems very specific, e.g. Number of reallocated sectors. I'm not sure how you think this is 'poor specificity', the stats are measuring one thing exactly, you can't get more specific than that!