Here is a lower ranking view point from what you have said---IF HE LEAVES .003 when boring, he probably uses a drill driven hand held hone to finish the bore----Does he have a Sunnen CK10?????

IF HE CHECKS THE ALIGN BORE with the equipment he has AND says it generally doesn't need it----He doesn't have equipment for align honing---the words from him are the words generally said by machine shop persons would would like to have this equipment but don't--
As a older than me guy once said---there are those who have the equipment and there are the ones who say its not needed but wish they had it!!!!

And, please, I'm not saying he doesn't---