A higher proof generation cost can be seen as a negative for a few reasons:

• A potentially longer time to finality

• Imbalances the ratio between gas cost and proof generation cost

• More expensive transactions

We are not concerned about the longer time to finality because we achieve instant finality through our protocol design, by circumventing the need to wait for a proof when on the rollup (proposed blocks have the same finality as the enclosing Ethereum L1 block, see: Layer 2 Finality). In the case where a proof is needed, such as moving assets to another layer, we are optimistic about new methods for bridging that don’t require a full proof.