You can already get the FPV camera on the Inspire standalone (looks like the O3), but I doubt it will improve targeting capabilities much. The FPV link is 720p, unless they changed something, but I wouldn't be surprised if they use analog cameras which cost $10.
Maybe not targeting but the follow up BDA reports. Instead of having to send in a second drone to see the bomb damage, the same system can be used! Also, no need to wait for timing of a satellite pass over either.
My experience with DJI drones is that once you put anything on them, the tuning of their flight controllers leads to substantially worse flight times, stability, and overall safety.
I know the Mini 3 can carry a naked GoPro without struggling too much, so a mavic might be able to carry a couple hundred grams with decent performance. But the flight characteristics go out the window pretty quickly, so I suspect you couldn’t carry much explosives on these things.
I have no idea how much is needed. Maybe a small amount is fine.
does it have to be accurate? if you want to just use it for suppressing fire, i bet it's pretty effective. it's probably effective as a psychological deterrent too.