User blog comment:Abyssal Horror/Mind blowing theory/@comment-4851119-20130717141553/@comment-4851119-20130724170210

Rogue Trader canon was abandoned from 3rd edition onwards because it was originally intended to be a dark comedy, but people only seemed to like the dark, so they just went with GRIMDARK, leading to 40K as we know it.

And Plague is right, the Winds of Magic come from a Warp Rift. It's actually a wonder they aren't present in 40K (either that or they do but nobody knows or gives a **** about them)

Simple as that.