Isn't fuel generally only dumped because landing a (nearly) fully fueled plane exceeds the maximum landing weight of the runway? Or alternatively, if a plane d

Isn't fuel generally only dumped because landing a (nearly) fully fueled plane exceeds the maximum landing weight of the runway? Or alternatively, if a plane develops a leak in one of the tanks, it can dump fuel to balance the weight. Is there a scenario where a plane in flight has its fuel on fire and dumping said fuel helps in any way?