Why do new Mazda 3s still have a torsion beam rear suspension?

Torsion beam suspensions are old-school, but the Mazda3 still uses a rear torsion beam even in 2025. Why has Mazda stuck with this old suspension tech?
IEEE

Design of a Torsion Torque Estimator that Includes a Backlash Model for a Load-Side Angle Control System that Consists of a Motor, a Reduction Gear, a Spring, and Motor/Load ...

Abstract: In order to reduce the weight of industrial and collaborative robots and also improve force control performance, the tip of the motor output shaft and reducer output shaft may be configured ...
IEEE

Position Control of a Two-Degree-of-Freedom Parallel Robot Including Torsion Springs and Motor/Load-Side Encoders

Abstract: In this paper, the position of a two-degree-of-freedom parallel robot with rotary motors is controlled. A low stiffness coupling is inserted between a motor output shaft and a link. The ...