I don’t know how exactly it’s set up in the US, but in Germany the best before date means essentially “we guarantee no substantial change”. That means, if the liquids in a yoghurt start to separate after a week, the date is one week after production, even though the complex refurbishment of “stirring” might make the product perfectly edible for weeks after. I’m involved in a local food sharing community and I’ve eaten yoghurts literally months after the official shelf life, they were fine.

Two separate dates would already do the trick. Like “best before” and “not after”. Both are relevant, but they mean very different things.