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by arijun 1971 days ago
You’re 100% correct that it doesn’t have to be better, if gp was wrong about oxidization being the main issue. If the largest problem was evaporation of some oils or something, the vacuum would likely exacerbate the problem (imagine someone vacuum sealing a carbonated drink thinking it would preserve the carbonation!).

In the end, though, I think most people discover that those pumps do help preserve the wine for significantly more time.