Ummm where did you live because that stopped waaay before the 90’s/2000’s in my area (more like 1960’s/70’s)
But as to why, it was often more of a local operation and in reusable glass containers. So the milkman would pick up the empties and drop off fresh.
Milk also didn’t used to be ultra pasteurized, so sitting on store shelves would take a lot of time off its lifespan.
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