Old medicine in new bottles

Only an alternative political force under Dalit leadership will end the neglect of Dalit issues.

The idiom “old wine in new bottles” is old but still famous. It is also mentioned in the parable of Jesus in the Bible. Yet, this idiom should be rephrased into “old medicine in new bottles”. I’m no connoisseur of drinks, yet I know that maturing over time enhances the quality of alcohol: Its aroma, taste and colour become more affluent. But date-expired medicine is useless, if not toxic. So, why not say, “old medicine in new bottles” instead?