I installed MSFS Premium Deluxe on august 2020. There were already FSX flight model set as default. Everything worked OK. Then, after some update the rudder problem started and I stopped use MSFS and turned to P3D and FSX. Just some time I verified MSFS if the rudder problem was eliminated. I never tried to use Modern flight model. The facility changing crash realism is very handy when various flying experiments I am doing. This, and similar, are included in other SIMs.