Hubcaps serve a purpose.. They make it easier believe it or not to change a flat.
True story Two big burly Michigan State Police troopers came in holding a 4-Way lug wrench to complain the lug nuts were so rusted they could not get 'em loose.
I had them sit Radio while I took the wrench and loosened the nuts.. The Wrench was a bit... twisted.. but the nuts came loose... (Those troopers suddenly had a lot of respect for their dispatcher for some reason)
NO I'm not that strong.. I just know how to throw my weight around.
Hubcaps prevent rust on the lug nuts.