posterior capsulotomy in FFD correction in TKR

Is Posteriors capsulotomy for  FFD correction in total knee replacement ever needed.  Although literature supports such a technique, I feel it's never  needed  and would cause posterior subluxation of the  TKR. The only time i did it early in my career the pt had posterior subluxation. I start with posterior capsule release from tibia later from femur and lastly gastroc origin to correct the bounce if needed. if pt has a tight fixed flexion varus  deformity I would take 2 mm more from the femur to increase the extension gap and use a larger femur in an anterior referencing system if in between sizes to decrease the flexion gap.

 Any other views or comments are welcome.