Try growing up in the late '70s early '80s, when adult behavior at social gatherings was almost a contest to see who could get the most obliterated-drunk, both men and women, and "one for the road" wasn't just an expression.
I'm of the children of that generation, and when we were young we modeled our socializing after that, going out for the night involved getting hammered, didn't matter who you were.
I've become quite relieved to see that in a last decade or so, the drinking culture of social gatherings is largely gone Even in people of my age range.
Of course, there's always one or two out of 20 people that are 9 drinks deep within a couple hours and not realizing that nobody else is consuming.
The plan is in place not for toxic drinking culture, but to deal with those people. Once the precise amount budgeted for the first few quality drinks is gone, that's when you bring out the low-bottom budget cans of expired beer, still on the plastic ring but with 2 missing and they are only basement cold.