Backstroke often looks simpler than it feels. Swimmers can breathe the whole time, but the stroke still asks them to balance on the surface, rotate well, and trust an arm path they cannot see. That is why small posture changes make such a big difference.
This page organizes backstroke into the same questions coaches ask at practice. Is the swimmer high enough in the water? Are the hips rotating with the shoulders? Is the hand entering cleanly enough to start a real pull? Once those answers start lining up, the stroke usually becomes faster and much easier to repeat.