Now you know....

Very informative

So why don’t “best before” products also have “expiration dates”? When the quality goes down, when does it actually get spoilt?

To many, unfortunately they're tge same despite hiw many times you'll tell them. When they see it's past the best by date, they'll throw it away even uf it's still good. Even when I've tried explaining to tgem that even though it's past the best by date, doesn't mean it's expired