I worked on GE’s frame E prototype 200MW that went to Virginia Power. GE had issues with the ceramic coatings on the blades forty years ago.
From what I’ve heard blade erosion is still an issue for combustion turbines.
Seems odd to have an erosion problem on gas turbines.
The only reason I can imagine for blade erosion on a combustion turbine is condensation in the gas.
But at the temperatures that gas turbines operate I can’t see how there would be any condensation.
The remote possibility of ash isn’t worth thinking about.