HP, this is my opinion, so take it for what it's worth.......ALL seedstock breeders in ANY breed should be raising the type of cattle that thrive in their environment, PERIOD. Maybe that's a HerfxAng Baldy cow, maybe it's Brangus, Brahman, Santa's or Longhorns, maybe it's Galloways, Highlands, Welsh Blacks or Luings. As far as I'm concerned, the color, the shape and the size is NO indication of whether a cow CAN or CANNOT raise a live calf every year for 18-25 years.
In my part of the world, I can tell you what body type will PROBABLY thrive, but I can't look at any one heifer and say conclusively that she'll do it here, or anywhere else. The only true way to know, is to wait a few years, and see which ones are still standing around chewing their cud with a fat calf at side, after you've strictly culled for fertility, foot, udder, eye, and attitude problems. The ones that pass the tests are obviously the ones best suited for their region.
I had a guy once say to me, "I don't know why anyone ever said that these black cows eat less. The ones we bought are eating as much as the red cows." I had him show me his cows, and the black cows he referred to were black Simmentals, and his red cows were red Simmentals. All the same size, and same body type, but he expected different results because someone told him that the black cows he'd bought eat less. To me that's as ignorant as saying small cows are better than big cows. Use some common sense and let Mother Nature teach you what can and can't survive. She's been doing it for centuries, so she ought to have it figured out by now.