I noticed that the wording on my raw chicken from Whole Foods changed to "best if used by" from "use or freeze by." I worry because they aren't equivalent. Is A

I noticed that the wording on my raw chicken from Whole Foods changed to "best if used by" from "use or freeze by." I worry because they aren't equivalent. Is Amazon just weaseling so they can sell older food? Why can't we just use expiration dates? How long is this safe to eat?