Another issue often missed by software teams is the fact that with analogue sensors, any erratic indications are damped by the meters or are simply ignored by the crew. Converting the outputs of the sensors to digital format doesn’t ignore the noise in the signal and, with polling if the sensor, could lead to large discrepancies in signal used for the controls.
You simply must do thorough testing of flight safety critical systems including flight trials.
Inexcusable imho.