That is because the gas (currency) transfers must be atomic with the script block confirmation
As I understand it, gas is paid within the script activating transaction.
Yet we also explained above (and even monsterer agrees on this point fwiw) that cross-partition spending breaks the Nash equilibrium.
You're putting words into my mouth there - I agree that there is a disincentive to merge partitions yet partition merger is essential for consensus; that is the basic problem facing all trustless p2p currencies and is particularly acute when there is no mining incentive.