I tend to agree it dose have to put in perspective. How much differance would it make to a 22 hornet, a 308win, a 300 mag? For smaller cartridges and match shooters may be more. For most big game hunting cartridges shot under real hunting conditions likely not noticable. Like peeing off a rock into lake superoir but please notmypool.
With that said on ten yrs of reloading I gonna have to get one of those tools just to see. If I only see gold dust it will get duty too.
And once a case that wasn't deburedis fired is there any bur left? Seems like any foil like bur would be burnt off? After all once fired shell are the most accurate brass for many reasons.