Tesla uses the same paint and coatings as everyone else. It's not any softer or harder than BMW, Mercedes, or Ford. All automakers have been using the same paint and paint systems for 20+ years now. It was an issue 30 years ago when the first low-VOC formulations were done - but the techniques and formulations changed to make them better. That said, no automotive paints can hold up to being sprayed with gravel - even old VOC paints.