Back in the day (1980s/ 1990s) they were a “sporty” option people would put on their cars for looks as much as function. It does serve a good purpose but I can remember stories of people leaving them on for months at a time and dirt would get under them only to do more damage to the paint than if you had never had one on! I only used mine twice on long distance trips, as I discovered it didn’t work right to me. No matter how hard it is strapped down at highway speeds air gets under it at the headlight holes and causes the edge alone the hood to flap up and down (which clearly isn’t helping to protect the paint!)
But I supposed for a non highway trip on a road with small rocks or large bugs it would be a big help!