DAE catch guys zeroing on the fixture instead of the part on a 3 jaw
Watched two guys in a row at our shop in Dayton dial in their vise jaws to within a tenth last week and then wonder why the bore walked 0.003 on the second op, when the whole issue was a chip under the part sitting on the parallels the entire time.
Honestly the "tenth on the fixture" thing is exactly like people who clean their whole house before guests come but forget the bathroom trash. You nailed the exact size of the problem, it's never the fancy stuff. Tbh a chip under the part will get you every single time no matter how pretty your indicator sweep looks.