I've rebuilt many HD diesels that always had been run with high degergent oil and many were absolutely spotless inside.
Add to that my 87 Chevy Suburban with a 6.2 diesel. Run on Shell Rotella for 520,000 miles before it blew to pieces. That due to a main bearing web failure. Pulled it apart an it too was absolutly spotless inside. None of the "crud" you mention anywhere. Clean oil pan bottom heads and valve covers.
Not all degergent oils are equal in detergency, and you didn't mention any specific engines or oils. I do know that the engines I've torn down that were used with Shell Rotalla or Deere TorqGard were spotless inside - even after very high hours or miles. On the other hand, engines that had been run on Quaker State HDX tended to be a little grimy inside - especially Detroits.
I never heard the "wives tale" of 12 volt ruining a 6 volt starter though. It was standard knowledge that it worked fine in any shop I ever worked at. 6 volts will certainly ruin a 12 volt starter though.
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