I would agree that its imperative it starts up and closes fast too! But this is how i am seeing it
"ingame" would only have the most basic settings, graphic settings, sensitiveness,
brightness etc but no stats etc
Battle log would be separate from the actual game where you can too adjust all the BF3 settings, think of it as a universal sort of tool thats going to be used for further BF games and others alike, they are only putting in the absolute necessary stuff in BF3, leaving it to be well optimized
I honestly do think its a good thing, it'll just takes some adjustment