If we are talking about rubbing the plastic, you hear a noise inside the truck but its harmless and easily fixed. if we are taking about rubbing components, thats a different story.
IMO if you did it quite often it would probably be harmful but its probably not as bad as rubbing a concrete curb with your sidewall. Its something I can live with until I get a new set of rims in the future.
2018 GMC Sierra SLT 4x4 Z71
2.25" Procomp front only level kit - Dealer installed
275/65 R20 (34.1" x 10.8") BFG KO2 tires on stock 20" chrome wheels
Very minor rub on passenger side inner fender well, fixed with zip-tie. Rubs passenger side upper control arm at FULL LOCK turn to the left; you really have to be turning hard to make that happen. Driver-side seems fine, I can't make it rub at all.