Unilateral chain exit is subject to the constraints of the chain itself, not the L2. The gripes about Lightning are because of this, not Lightning itself, beefing with Lightning is beefing with how the chain works underneath it.
Since supply being the only real scaling limitation if we're talking about billions of users, L2's cannot scale sovereignty until the chain does.
You can't unilateral exit millisats if the chain does not recognize millisats for example. No L2 can solve this.
