I don`t think the hardness claims are questionable. They are simply a property of the SiO2 bonds. Everything depends on the thickness and the pressure. I get pretty good scratch resistance with coatings from fingerprints, using dry MF towels (it happens in small bits!) and grubby little hands around the door edges and handles. However, backpack zippers and straps as well as twigs on bushes in the alley and Tesla employees usually are pretty adept at scratching things.
Here`s why I use coatings:
1. They look great
2. They make washing easier
3. They offer UV protection and help with water removal
4. Minimal scratch resistance.
(Sent via my mobile device...)
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