so seems like the Fenix 6 series have now three types of glass: Gorilla glass, Sapphire glass and "Power glass" (solar). Most probably the Sapphire will be the most scratch resistant glass, but what about "Power Glass"?
I tested this yesterday, solar intensity with and without a screen protector, and the numbers were identical. A screen protector doesn't seem to affect the solar charging at all.
Thanks for testing and sharing.
I can corroborate this with testing too