@Candy Turbo; I’d be surprised if a ceramic coating provided much - if any - protection against stone chips, especially projectile stones travelling at speed that’ve been flicked up by the vehicles you’re following.
If your car’s ceramic coated and it’s stayed free of stone chips, I’d say a) you probably drive leaving a good distance between you and any vehicle in front to minimise the risk of projective stone damage or b) you’ve been fortunate to a greater or lesser degree or c) or a combination of a) and b).
PPF is probably the way to go for anyone really wanting to minimise the risk stone chip damage, but it’s an expensive solution to the problem.