There is less spray with mudflaps and I find it keeps the sides and rear panels cleaner after heavy rain - snow just compacts so they are less effective. However, the vehicles traveling close behind probably benefit the most as there will be less spray coming from the car in front.
I haven`t yet. Will try it soon though, just need to either go buy a car jack or drag my lazy ass down the the Polestar shop where they make the adjustment for free once a year. Soon 🤞
Must be a coincidence, maybe because I didn't drive far enough? Regardless, from what I see the rear mud flaps have a positive effect, but not the front flaps.