The article even mentions we still have "bending at the hip" in our culture as well especially in sports, yoga, and gardening. But we could benefit more than that.
And posture is cultural in that it varies somewhat depending on where you are. A military bootcamp would have a culture that promotes a certain posture. Even between a English tea room and a Japanese tea room there's different rules about posture. Then you can also even consider the fashions in an area. For example people who wear heels a lot (even a small heel) vs someone who is constantly wearing flip flops will have a very different squat. People who wear heels a lot will have a harder time doing a squat while keeping their heels down due to a shortening of the muscle on the back of their leg.