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No offense Dan - there is merit in a warning about using them improperly. That being said if he removed .060 of iron with a rotoloc he used more than a couple and certainly more than what was needed to remove a gasket. Maybe he was trying to remove the indent from the fire ring?
A monkey can destroy anything by not giving a crud.
I see nothing wrong with using the correct abrasive or "finger" disc sapringly to clean off residue, being careful to keep the debris out of the bores and coolant jacket. That is what the directions say to do... Me and thousands of others have been using them since they came out with no results like that when care is taken to do it right.

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He didn't remove .060, more like .006-.007. I've been using abrasive discs for decades, the point here is that the deck of a block or head is not a good place to use them IMO. Buy the way, no offense taken.