Comparing TW and Paradox games are like comparing apples to a steak. Yes, you can eat both apples and a steak, but that's where the similarities end. Paradox games are strategy games, while TW games are tactical ones. Yes, both fall under the Strategy genre, but the scale of their focus is completely different and how time works in both games is entirely different as well. If you've ever played HOI3's eastern front then you'd see that the OP's idea would be a nightmare of epic proportions.