A few months ago I had the lucky privilege to enjoy a barrel tasting with the winemakers of a very well-regarded boutique winery (Wines routinely rated >90, selling for 50-100$).

We were discussing packaging, and things like boxed wine and screwcaps,
the head winemaker said that for his own use he actually packages his wine in large tetrapack so he can just keep it in a cabinet and extract a glass at a time. He said its better for the wine, but the market expectation for "high end" wine is that it comes in bottles with corks, so that's how they sell it.