That rotary rocket looks like a design that could work, tbh Instead of rocket propulsion, first stages could in theory deploy helicopter wings and get a decent

That rotary rocket looks like a design that could work, tbh Instead of rocket propulsion, first stages could in theory deploy helicopter wings and get a decent slow down even before spinning them up to full speed (with autorotation the blades act like a parachute/wings). Seems like it would be a harder implementation than the high precision control with a rocket, though.