Interesting. I just looked into the apple watches screen (i still have the series 4) & its the Ion-X & mine has taken a couple hard hits &there's hardly any scratches. & according to google the sapphire is harder compared to the ion x. So I think that eases my worries a little bit.

I'd love to go caseless but I'm scared to scratch the cameras. Do you put your phone face down? I always like to keep mine face up, but I guess it'd be a change of habit if I were to go caseless.