Ultimate tensile strength increases as well. Probably doesn't help when a material is in compression, but tension, shear and bending can be improved. Surface imperfections cause stress concentrations when materials are mechanically loaded, which act as a "nucleation point" for failure.
...but if you're running that close to the limit you probably have other issues. I have never polished something with the intention of making it stronger. Just make a better part.

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