> We can arbitrarily divide on any L2 But you can't offer the chain's security with those, so all roads lead back back to trust and centralization.

You can offer chain security the same way lightning does. Or are we going to argue an instant lightning payment is as final as a confirmed block is?

L2s will eventually offer chail-like security. Lightning is essentially that. There are improvements and technologies that will exist to enable L2 with cheap, guaranteed, unilateral on-chain exit.