Allows pocket to do more bombs with the roamer, focus damage and cover more ground during midnights or even pushes. Scouts can get more heals and allows your demo to become more of a tank and focus on holding chokes, preparing traps and distributing damage from distances while the soldiers are focusing on their combo. However this can leave the medic more vulnerable if the demos pipe dm isn't reliable. That isn't exactle a bad thing, it forces the demo to get better with pipes and honestly they should be doing that no matter what.
Hell, experiment with one soldier running blackbox and letting the other get heals at rollout like how the roamer does, the blackbox soldier makes the first move at mid, throws some damage down at the combo and backs out. Aka firing a rocket at the target while bombing in, then landing on them and using one rocket to jump away while Inflicting damage on said target. Meanwhile the 2nd soldier follows up (I mean they are jumping together so it's like a split second for them to react) and follows up the damage already done.
There is tons of room for experimenting with this stuff