Fluff change is part of the game, you can't expect the fluff to stay the same for a plot that is open-ended. 40k will never have a defined story (for a respective army) because things need to change and stay fresh otherwise no one will play this game.
Getting back the main point, I don't usually base a game on fluff but it does help flesh out why the game is going on and how the two armies in conflict interact with each other. But this is a strategy game so I do tend to focus on that aspect of it, and i do keep in mind the fluff, so, I have to say I'm torn here, I guess I do both...
Getting back the main point, I don't usually base a game on fluff but it does help flesh out why the game is going on and how the two armies in conflict interact with each other. But this is a strategy game so I do tend to focus on that aspect of it, and i do keep in mind the fluff, so, I have to say I'm torn here, I guess I do both...