When I play A:DD after A:MFP

[Fortigurn]

Yeah, this makes me glad you weren't allowed to throw stuff around like an utter maniac in A Machine For Pigs.

I do agree, however, that I get a better sense of being in the game world when I have more opportunities to mess with objects.

It's not about messing with objects, it's about the immersion. The more you can interact with the world, the more you feel you're in it. The greater the level of puzzle complexity (the stacking puzzle in Justine for example), the more satisfying. And then there's the challenge of using the environment in ways the developers didn't consider, as in TDD, in which you could use objects to reach places which were apparently off limits, or get to areas without your hand being held.