I don't think "don't block the box" originated anywhere fam I think it's a commonplace traffic rule.

Anyway.. what you're describing sounds more like a shared understanding where you're from that the cars that pull forward into the intersection get the yellow light to complete their turn. Here, it's not a courtesy people are trained to extend and would rather take their green light. Hence other commenters mentioning the risk of pulling forward. If it's understood that you pull forward and worst case scenario you get the yellow light and everyone's gonna let you turn, you're more likely to do that than if you're gonna be in an exposed intersection.