Eating meat is not the same as eating a sausage. Sausages are shit they're barely meat.
If someone tells me they ate chicken, and they meant "I ate 'chicken' nuggets." I'd call them on it. So it's not pedantism because we're on a forum, it's pedantism because I'm neurotic.
Anyway, eating beef specifically 5 times a week is fine. It's not great, but no one I know eats that much beef. I tend to eat that much, but I particularly like beef, and I can't afford to eat roo, fish, and chicken all the time.
Also, most people eat too much of almost everything in the west. Getting into the nutritional stupidity of Australians (I don't know enough about other countries) is something I'd love to do via a non-text medium, but it's a little bit of a hassle to type it out if I'm only having a discussion.
We feed them chaff though. Corn's not that easy/popular to grow in some parts of Australia if I recall correctly. Chaff is a by-product of making food for humans, we can't eat it, and it is actually better for the animal to eat chaff, grass, and wheat than to feed them purely grain. Grasses are the best, they're just the hardest to organise.
You're right about the roo. It tastes amazing, but it's too gamey for some people and if you cook it too much it is literally impossible to eat. I fucking love roo though, we even get roo mince, it's delicious.