I also thought about that medical stasis function.
Reading both of your comments an idea could be that stasis needs too much power/resources that are limited on those spaceships.
As Zack stated, they are limited range ships, so why not.
time travels again:
Zack also said this ship is/feels like a model of the past. At least I think he did.
Culprit (potential) not discussed yet:
-Funicia: split personalities ? her puppet show is very weird. She feels a bit young to be an assassin and able to just remove the radio from a ship. But loli murderers/assassin with top intellect, steel nerves and olympic strenght/moves are a bit too common in anime...
Used as a child bomb or some sort with brainwashing and specific training ? Nah, too bland.
-Quitterie: Not enough background. She probably feels the most stereotypical of all the characters with her rich girl syndrome. Might be a reason to suspect her after all
-Zack: Cold, logical, top intellect. Doesn't mean he doesn't have a loose screw somewhere...
Now let's get back to the first convenient plot device : the ship being at the right place when they got out of the wormhole.
It really feels like everything was scripted.
And in fact scripted from long before their trip as the characters themselves discussed.
But also, for some reason they are almost all from influential/rich or in power families.
And they all have traits/attributes that are useful for the adventure or lead a country...
Kanata is a leader
Zack is a good prime minister
Quitterie represents health/medicine
Background flower : arts/entertainment
Esposito: industry (I know... stretching a bit here)
Ulgar: army/defense
Charce: well biology, fauna and flora knowledge->food
Aries: airhead, mandatory in a sane society
Funicia: excess luggage
I feel like they are undergoing a hidden test that is performed once in a blue moon when very talented teens have potential for leading roles in society. Some kind of McPa coming of age in ultra hard/insane mode. Survival means they are good candidates for future leading roles in society.
But in that case-everything is scripted- the question regarding wormhole technology remains, why keep it secret and not use it globally ?