Yeah it's an interesting progression.
Hips are connected to the head via the spine. If you get the head high the hips will slide further forward in a powerful upper body driven stroke. The traditional method has been outdated at an elite level for sprint athletes for years now.
Interestingly butterfly is going the other way and they are trying to stay as flat as possible, no body dolphins or undulations which cause drag. Even the terminology is deliberately changing, the kick is commonly referred to as a 'double leg kick' not 'dolphin kick' to get people out that mindset.
I still think there is a place for low sleek streamlined breaststroke, you still see it in the longer distance races and particularly in individual medley where energy conservation is important. Plus what the elites do isn't necessarily relevant to the masses.