You absolutely need winter tires if you are RWD in a winter climate. Depending on the weather you might be able to barely get through winter with all seasons but it is a big safety risk. With 4 winter tires and RWD you will be much better off.
And anyone that has any kind of sport package with performance tires will be helpless whenever it snows. Dangerous actually.
MOTIV 750 ST | MOTIV PI | 100% E85 | Fuel-it Stage 3+ LPFP | JB4 G5 w/MHD BMS flash | Quaife | Íhlins | Brembo | Akrapovic