Did you read what they are replacing it with? I.e., "best if used by" (indicating the time the item is at its best quality), "best if frozen by", and "use by" (indicating when the food is and isn't safe to eat). Because those seem much more clear and useful to me than the useless "sell by" date.

The subtitle:

The law standardizes language around expiration dates, aiming to minimize confusion about when food is safe to eat. More than one-third of food sold nationwide is wasted, the U.S.D.A. says.