I noticed a widespread problem with expiry dates!

Okay when you compare three or more things, you say that one of them is the best, but if there are only 2 objects to be compared, you say that one of them is the better.

Here's the problem. Expiry dates usually follow the words "Best before:" Now there are only 2 things under comparison: the quality of the product before the expiry date, and the quality after the expiry date. So shouldn't it be "Better before:" instead?

Also, which is better, milk 1 day before expiry date or milk 2 days before expiry date? Its quality is already the best before the expiry date, so how can anything be better than the quality of the best possible quality of milk?

Then logically speaking, if the milk is really "Best before" the expiry date, that must mean that the quality of the milk remains completely unchanged at any point in time before the expiry date, and only starts deteoriating at the point in time of the expiry date.

Make of that what you will.