Ah, now you are focusing your question. The reason why we don't have machines that can do it all cheaply is because there is not a large enough market for them.
If someone in China thought they could sell 4 million of them at harbor freight, in the third quarter of next year, they would have them in the catalog by then.
Same reason "professional" equipment always costs more than hobbyist equipment, supply and demand. FWIW, You can get a case and bullet fed machine from Lee that doesn't need collated primers, it's called the Loadmaster and would cost under $300 new with the bullet feeder and all the other bells and whistles. Only problem is that no one can get one to run 100%.
And that leads us to the most important feature that you forgot, "that works".