I don't think adventures like this need to have a purpose, like creating a rideable route through the Darien Gap. Very few endeavors like this have a tangible purpose; climbing K2 doesn't, hiking the PCT doesn't, riding a bike around the world doesn't. People do them because they want to challenge themselves, or shake up their lives, or just be able to mark it off as a personal accomplishment. And I don't think having a support vehicle made it any easier to haul and hoist their bikes across ravines, mountains and rivers.
These guys did something flat out amazing, without any equivocation.
"No matter where you go, there you are."