Some pistons look even worse, but I think what you show is "State of the Art".
My local "mentors" taught me to make a sonic cleaner with either a denture cleaner or an orbital sander and place new or reworked engine parts in solvent, then give everything a good shaking until you feel that it's good enough. One guy would leave the parts buzzing away over night in a denture cleaner. He was one of the Top Dogs around here when it came to this stuff, so nobody questioned his swarfaphobia.