Most Canadian associations of Continental breeds "record" 1/2 bloods that become "purebreds" at 15/16.  They can never become "fullbloods".  Fullbloods/Full French or other nomenclature all trace directly back on both sides of the pedigree to the original herdbook in the country of origin.

Upgrading was deemed as the best way to grow the breed population in the early years of importations and actually get to genetics into application in the industry (market driven).

Red charolais are designated with a "Q" prefix in their registration number and the first red Charolais Granada's Red Ace 17B (which created quite a stir) was extensively blood typed and DNA tested to ensure pedigree integrity.

Currently most breeds DNA PV embryos and fullblood cattle.  LM for example have Parent verified every fullblood since movement into the country.

While I agree that accurate pedigree is very important and maintaining purebred populations is important, I don't think that purity necessarily trumps usefulness when it comes to industry.