My only comment is this. I can't see what your rotors look like, but it is normal for them to wear in a way that may look weird, like some small groves, but they all do that, and it doesn't affect braking or how fast they wear.
Since I can't see your rotos, peek at some rear rotors with a flashlight at some on your dealers used car lot or their service lot. If they look comparable don't worry. If they are noticeably worse, they could warranty them if they want to.
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