Yes but what if you store it after removing the oxygen? And just the oxygen. It might last a lot longer. Then put it back at the end and taste it.

Industrial companies have a lot of resources and techniques available to them that the typical person making juice in their home does not. For example, what if they pasteurize the juice? Then it might also last longer, etc.

Some people react negatively to these sorts of scientific techniques out of what seems to be the naturalistic fallacy, a sort of (mistaken) belief that "natural things" (whatever that means) are intrinsically better.