Maybe I'm the only pilot put off the entire badge system by the 5 hour duration flight. I'd surely get dull and bored after ~3.5 hours and flying dull increases risk. The benefit that I'd subjectively assign to a longer flight does not offset the risk that I subjectively perceive.

Even though I'm already an old guy, my endurance in the air has slowly increased over a decade of flying to about 3 hours. For a younger pilot, 5 hour duration flight might be more a matter of skillfully finding lift, and less a matter of raw endurance.