Well, a lot of that kind of blanket statement seems to get a lot of space (panel gaps too) on this site, but I think there is some nuance. I am appalled at the fact that I have peeling pain on the drive side door hinge and that already have black acne on my rear bumper right behind the tires (now have flaps that DON'T rub). BUT, my white paint has considerably less "orange peel" than my more recent bimmers and my GTI, tho not as good as my Porsches. It has also held up very well wherever applied to metal (the bumper panel being plastic.).
Can you send a link to your mud flaps that don't rub?
I'm wondering why some people here said that my mud flaps might be bad for the paint.They're fixated, they don't really move, I don't see how they could scratch anything. Dust might get in between the flap and the paint, but it's just dust, nothing compared to the paint chips they're avoiding on a regular basis (can often hear little stones hitting them randomly on the freeway, or obviously on a gravel road).