Braided Brake lines

as explained to me by the owner of a place that plumbs race cars, the only reasons most of them are not DOT legal is
1: they have no place to print the DOT code on them. solved by some higher end ones by installing a band with the number a la tagging a birds leg
2: they have not passed a "whip test" 49 CFR § 571.106 - Standard No. 106; Brake hoses. again, the high end ones apparently have a lab do the test.
i've run shop built ones on the street for ~30 years without the DOT knowing about it, no problem