Did everybody forget about the body of the poor cadet with that chest wound?
We know Seven of Nine was able to revive a dead person that was dead for 73 hrs after initial death thanks to Borg Nanoprobes. I wouldn't be surprised if we had Federation Nanoprobes by this point.
Crusher suggested the use of 'destructive breed of nanites' to fight the Borg... only trouble is, at the time (mid 24th century), it would have taken about 2 weeks to produce them.
So, Nanotechnology existed in the 24th century... just 'conveniently' forgotten.
Oh and we shouldn't forget that Wesley was able to make his own nanites which eventually turned sentient.
It definitely didn't feel like 73 hrs has passed by.
Lots of cutting in between scenes. The trip to the nebula and back probably took up most of the travel time.
The fact that they're willing to bring back the Bajoran Chief Security Officer in Lower Decks after he died in an explosion.
Why can't they save that poor cadet?
Beam his body and shuttle back up.
Use the Nanoprobes on him.
It's not like his head was smooshed into chunky salsa.
The brain seemed intact, the medical personnel on the armstrong should try to save his life.
We don't know if they have. On VOY, nothing was officially explained in terms of how the crew managed to expend more shuttles and torpedoes than what the ship had, but some of us did posit that the crew simply beamed the wrecked shuttles (at least those they could) back aboard, harvested them for raw materials and made new ones.
Same with photon torpedoes... making the casings and most of the stuff for the torpedoes is pretty simple, so that just leaves antimatter.
VOY crew could have traded for it with other species off-screen, or they found another source of omicron particles to increase their antimatter reserves.
Similarlt here, its possible the Armstrong beamed the wrecked shuttle and the cadet's body back aboard and revived him... but, since nothing was stated on this ... and as I said before, in the 32nd century, when people are proclaimed dead...they likely remain dead (no extra attention goes into trying to revive them).