6DoF
In traditional 3D space, there is what is known as 6DoF, or six degrees of freedom. This refers to a Rigidbody’s ability to move in three axes (up and down, left and right, or front and back), as well as three rotations (pitch, yaw, and roll), to give the object full freedom.
With 2D sprites, you lose the ability to translate with depth (front and back) as well as rotating with a pitch (forward and back) or yaw (rotating perpendicular to the horizontal axes, like a top). Since 2D is construed as “flat,” you cannot truly go deeper into a Scene or rotate vertically around an object’s pivot without faking it.
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