>>1797939>>1797942>wear on the pawls/teethIt does happen, but even over a long time, the wear from coasting is negligible (just witness marks). This is an old Deore II freehub that I rode for at least a decade. The wear on the freehub body ramps is from when you lay on the power. There was matching wear on the pawl tips, but I don't think I took a picture of them.
I took this apart because I suspected a broken pawl tip. Sometimes the cranks would 'slip' in high torque situations (starting from a dead stop, laying it on at the start of a climb, etc). That is, temporary resistance at the pedals, then suddenly none, the crankarm just drops from 1 to 6 oclock. Pretty jarring sensation.
There's no fixing this kind of wear, replacement is the only option. Shimano freehub bodies are cheap & easy to find though.