Oh, I get what you're saying. My understanding was that not all things would use aniso, even if forced on. It's really for large, repeating, textures that stretch from far to near. The only thing that might apply to is the ground terrain, only the texture size is so large, so broken up, and often (when in flight) so distant, that you never are in such a position to have something an inch from your view stretch into infinity.
Like, the ground in an old Half-Life map stretching from your feet off into the distance, for example. That situation doesn't come up in AH much (at all?). So even if forced on it still wouldn't be enacted just because most of our game is "air."