As a matter of fact, I am struggling to think of any boardgames which have a 3d component. I am sure they exist, but a robust 2d representation feels easier and would still be applicable to 99% of existing games.
Stacking mechanics are typically where you want the engine to defy physics, though. For example picking up a stack of cards, the stack is typically treated as a single object rather than 52 individual objects that can fall apart.
Playing virtual poker, you probably don't want to have to manually manipulate individual poker chips or move around wobbly stacks of chips (yes that can be fun in itself, but there will be someone who struggles to move their chips around intuitively and inevitably delay the actual game at hand).
Having said that for games like virtual Jenga, you absolutely DO want to keep those wobbly blocks of wood.
