A bottle is usually about 4 glasses (which is consistent with my experience, not sure how you made your calculation), so when shared, that's one to drink with the meal and one to share over conversation after. I'm far from a teetotaler, but it doesn't seem terribly excessive when phrased that way.
It may depend on your upbringing. In the modern US, particularly the more puritan regions, any alcohol at all is usually considered a luxury reserved for celebration, but in some parts of the world, wine or beer is just the drink you drink with a meal, and there's less of a stigma about it. If it's not your thing, it's not your thing, but applying the label "excess" is a pretty specifically cultural decision.
It may depend on your upbringing. In the modern US, particularly the more puritan regions, any alcohol at all is usually considered a luxury reserved for celebration, but in some parts of the world, wine or beer is just the drink you drink with a meal, and there's less of a stigma about it. If it's not your thing, it's not your thing, but applying the label "excess" is a pretty specifically cultural decision.