Safety was compromised
The battery fire in the JAL plane took the Logan fire department, with unlimited extinguishing agent and manpower, plus ground access, a half hour to extinguish . That does not look good for an in flight recovery. Then the ANA incident proved damage in flight was not contained in the compartment, but rather that fumes impacted the cockpit and passenger cabin. Seems reasonable to me to conclude that this is a safety of flight issue.