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The issue isn't the OEM bearing quality it's the clearances, correct. Although I'd rather have copper in my bearings if given a choice.
If you want to refresh and adjust clearances on the mains, depending on which bearing color/size they used originally you may just be able to go to the next larger bearing color and be OK. If not then yes you're cutting and refinishing the crank to whatever spec your builder specifies. On damaged journals, generally you polish/cut until the journal cleans up and then measure to see where you are. There may or may not be bearings available that would work with the new smaller journal size.
Sometimes the journal scoring may be so bad that you have to weld up the journal and rebuild it.
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