I think there's a basic misunderstanding, perhaps instigated by what I posted about bull selection for specific purposes.
I don't mean to say that any bull I would use can't throw great heifers or superior weaning weights... both. What I'm saying is that I differentiate between bulls. In any group of bulls there are going to be differences. I don't care how many or what breeds or whatever... I'll evaluate them for specific needs and use them accordingly. A great heifer producing bull is still going to have a significant number of male progeny, so I wouldn't discount that fact, just as I wouldn't always discount the heifers from a bull that I intend for terminal calves. But if the bull performs as expected the terminal calves will be more likely to go to feedlots and those bred for replacements will be more likely to be held as breeders.
We can see a pretty good example of a dual purpose and dual body type breed in Shorthorns. And I like Shorthorns a lot. But it seems they get a lot of disrespect at the point of sale for no good reason, IMO. If you have a bunch of dairy type Shorthorns and put a beefy, muscle-maker on them you'll get calves that will do good as replacements and as terminal crosses. If you have the beef type Shorthorns you will get different calves depending on what kind of bull you select... just like with any other beef type breed.