We breeders like to see those level spines & tail heads and the show scene has made breeders breed them that way. I myself like level hips & pins in my cows however I prefer to avoid those high tail heads as it increases the risk of calving difficulty. Here in Australia we calve out in pasture so don't gave quiet the same control as those calving in confinement in the Northern hemisphere.
I will say one thing. Take a quick look at wild animals e.g. Bison, lions, zebras, giraffes, elephants & even tropical cattle like Brahman. Nature has made them all with slipping rumps and a downward angle from hip to pin. Natural selection produced this....