Brian Whatcott wrote in message . ..

I am not unsympathetic to this position. Still, the root is usually
undamaged, and it is the root that propagates the initial crack, often
enough.

Then we might ask what is being removed by the threading tools in the
process of cleanup, why, and what is the effect. It is a galling
problem & only a localized burr removed, or is one recutting into the
work-hardened rolled thread? If corrosion has advanced to the point
of suggesting recutting, then stress corrosion may be be a darker
issue too. I'd at least dye-check it, wouldn't you? (I wonder how
much a new fitting costs him after all the prudent consideration,
inspection, die cost & trouble are tallied...YMMV)