I'm not sure turboprops would be efficient for a long-haul flight. They cruise at lower altitudes, which makes sense for short-haul (no point climbing to FL410

I'm not sure turboprops would be efficient for a long-haul flight. They cruise at lower altitudes, which makes sense for short-haul (no point climbing to FL410 if you're going to immediately begin descent for arrival), but for a longer distance I think that would hurt efficiency.