The damage comes from abrasion from grit, sand, or dust build up between the case and the phone.I change cases when I change phones. I got new case with my iPhone 14 because my previous case, for my previous phone, the XS Max, didn't fit it. Otherwise, I would have kept that case. So...at this rate...I've changed cases once in four years.
It baffles me that you seem to think leather or plastic cases would somehow damage stainless steel.
Uh......yeah.....you know, it's just a phone, right?The damage comes from abrasion from grit, sand, or dust build up between the case and the phone.
In some environments this can be like a grinding compound.
Keep the phone & cases clean.....shouldn't be a problem.
I take my case off once a week and give the case & phone a thorough cleaning.
I take pride in my stuff and like to keep it in good condition.Uh......yeah.....you know, it's just a phone, right?