> I think this is more an open question than “it has never worked.”I don't think so – we were talking about continually carpet bombing Iran to continually deny them access to a 1600km-long coastline. That simply has never worked. Not in Iran, not elsewhere to my knowledge.
> Bases on lines of sight and line channels, one could probably back out from transit paths to the places one would need to be to hit that target
That describes pretty much anywhere in the 7000+ square kilometers we're talking about. A drone doesn't need a runway. Anywhere you can fit a large pickup truck, you can launch a Shaheed drone.
> Nobody has tried to area deny FPV-drone navigators.
I'm not sure what you're saying here. Deny the area to Iran's FPV drones? If so, how? Use FPV drones to deny the area? If so, how? We're talking about continually patrolling 7,000+ square kilometers. The USA has never fielded such a system, and has no publicly known capabilities to do so.