Juicy Juice among other brands touts “100% juice” however if you leave it undisturbed for months on the shelf it never seems to develop any sediment. How can they be 100% juice and not have any solids? What exact process are they using to remove all the sediment and or perfectly homogenize the liquid? You will notice other shelf stable 100% juice brands tend to have a sediment, how do the large brands get around that, while still being pure juice? Is there an FDA definition of “Juice”?
Sorry, this seemed to turn into many questions.
Orange juice, in the US at least, will also add back “flavor packs,” proprietary blends of various citrus oils and other chemicals that are close enough to fresh juice not to piss off the FDA. MUCH more than any sourcing (as you say, it’s mostly commodified, ala Trading Places), this is what differentiates juice brands, and if you get a true off-brand that is not truly fresh and scrimps on the flavor pack, old orange juice is kinda nasty. This happens with both “from concentrate” and with the slightly more expensive “not-from concentrate” stuff that is stored with its full water content but still an industrial product.