I tended the bar for 6 years... at a location that was among the busiest in the US. I saw hundreds of folks with "light damage" on their products, some of it no doubt so they could make claims on their warranty and receive repair or refurbished replacements (prior to listing the exchanged, refurbished device as new, likely on eBay or CL).
The collective thought from ARS leadership was to "let the little fish go- don't stop swimming or we'll drown." The drown in question was 350-500 people a day waiting for their appointment at a bar designed for 100. When a customer comes up to you, you assume positive intent - and the goal is to make their day better, somehow. We're weren't curing cancer, but we had the option of helping out someone who was in urgent need. As an Apple technician, you have the choice, right from the beginning... do I make a customer interaction 10 minutes by looking past minimal infractions, or turn it into a protracted 45 minutes manager-required interaction of debating warranties and who did what wrong?
There are hard-lined policies designed to save the co. money, but ultimately, a dissatisfied customer shooting emails off to Tim Cook or Executive Relations because you didn't give them the option of using an AppleCare+ claim they wanted to exercise... you don't want that. My former Lead told me "listen, we're not here to be cops about the warranty, the very fact they bought it means they did the right thing at purchase-- beyond that, listen to their side, and treat them as you would your mom or best friend."