Your #2 point is basically the one thing that I would say I prefer from 40k over Warmachine. I liked being able to come up with a name, backstory, etc.
Of course, if you are looking for an actual answer I'd have to say that the writers didn't think it important to invent an actual logically functioning
You'd be surprised. Milk mixed with blood is known to be extremely nourishing.
That's got to be a typo. For that kind of money you can get somebody to paint the mini for you...
To be fair there is no background reason why men of the Empire have hands as big as a real persons chest but thats "Heroic scale" for you.