I think there's something generational going on there too. Being a non drinking young person is much more common now - 26% (source - https://www.theguardian.com/society/2022/jul/24/gen-z-for-zero-tolerance-why-british-youth-are-turning-off-booze)
So maybe the reluctance to make that a defining character trait is to make the characters relatable to the maximum number of readers.