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Did our parents' and grandparents' generation really give up this little luxury just to avoid having to shake the jug a couple of times before pouring the milk? Surely not. Probably homogenization* was was an industry convenience. Whatever the reason, it's a loss. A small one, sure, but a loss none the less.
*Homogenization is the process of pulverizing the milk fat so that it stays suspended in the more watery portion of the milk, rather than rising to the top as it does naturally. It is not related to pasteurization, which is the process of heating the milk to kill any potentially harmful pathogens. Most milk at the grocery store is both pasteurized and homogenized.