Same argument. See the composite back of an aluminum watch and compare it to the ceramic back of the Stainless Steel one. Composite gets scratched easily.
When I did own the sport watch, I never had issues with the composite back scratching. I understand that it can scratch ‘easier’ versus the ceramic backing, but I see it as the watch is either on your wrist or on the charger most times. I never had issues with scratching. I believe it depends really also how you treat your watch.
I’ve seen a lot of used aluminum watches for sale on eBay that had cloudy backs. They almost looked like headlights on a car that’ve been sitting in the sun for 10 years.
Autosol or PolywatchI’m not advocating someone try what I’m suggesting, but there is a product made by Maguiars called ‘Plast-X’, and basically it’s like a fine scratch remover that you can use that removes cloudiness, oxidation and I’m wondering if that would almost work to clean the back sensor area. You can also use it to clean scratched CDs, headlights, basically restore any type of plastic that might have light scratches or cloudiness.