So for me(maybe selfishly), I want as much lore and exploration as possible. If a group wants to play fast they can easily ignore all that and get on with it. So I say put it all in and let people choose whether to indulge in it or not.
Absolutely. I agree with this. But my concern is that for a developer there will be, if the MP side of the game is what they are emphasizing even if publicly they are not saying/admitting this, a very strong incentive to shift resources away from such things as lore, world-building, character development, exploring, even roleplaying, in favor of action and combat.