That doctrine works great for defending your homeland, when you are taking off from your roadside base and coming back home to a road-based airfield already on the map.

My understanding of these VTOL aircraft is they need to travel a long way, quickly, and set down in far less predictable conditions.

Are you saying these are for human transport? Sounds like real niche in modern warfare.

I suppose the argument is that X-76 could work in environments without roads. But that also implies without fuel or any other support on the ground.

What usecase is this? Where is a place "without roads", and that can be important enough for something like this?

Can it hover?

Why do you need hover? Its a pretty useless thing that requires shitloads of engineering (for a plane, not a heli). It sounds like a hollywood movie like requirement that is built for the purpose of burning tax payer dollars.