The primary cause of rotor problems I've ever had is hangar rash.
I noticed minor and harmless "warp" a lot more with cable disk brakes than hydraulic since the hydraulic ones keep themselves trimmed out by design. The cable ones I was always fiddling with the dials to try to bring out the bite point without the rotors scraping
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Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."