Not sure what Utah is like, but if you drove on our roads, you'd see exactly what I'm talking about. I can drive over large stretches of gravel and especially "sand and grit" on any all season tire or winter tire and get minimal kick up onto the body and fender/arches. You'd get an occasional larger rock, which is the flinging you're thinking of. With summer tires, there is something about the compound and the blocky treads that collects this fine grit and just sandblasts your vehicle. I've driven through winter sand laden parking lots in late spring (they don't get cleaned up until May or June here sometimes), even doing speeds like 10km/h, and you can just hear your car literally getting sand blasted when on Michelin Pilot Super Sport (or now, PS4/PS4S). I've experienced this on all cars I have run on proper summer tires. When you park your car after driving on that, you can see the treads with millions of pieces of sand stuck in the blocky tread, this is what gets thrown at the car when driving.
To add insult to injury up here, the city in their supreme genius decided to start filling cracks in the road by laying down some kind of road crush (don't know exactly what it is), driving over it with a steamroller, and leaving the excess debris on the road for weeks at a time. Doing lane changes over this debris, or driving through patches of it on summer tires results in that all too familiar sound of running your car through a sand blaster. It's enough to drive you ballistic.