I've noticed that on both my pedals (across a few sets) and a set of cranks that they develop a wear pattern on the underside (based on my typical descent position). On one set of pedals (Deity Supervillains) the wear was bad enough that they developed enough play even after greasing that I had to replace the axles. A second set of the same had marks but didn't have play after regreasing. I replaced those pedals with RF Turbines, and after about 9 months, those developed a click that went away when I swapped bikes. I haven't checked their internals...
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