Why does that actually matter?
I don't know of any Blessings that you could cast inside a transport that would last until you got out - as it stands, you disembark then fire off your Blessings or whatever.
It means if you have, say, Fortune or Invisibility, then you can't keep them up while embarked. So when you get shot down you don't have the buff up. Unlike last edition where you could benefit from things like Prescience even when someone destroyed your transport and assaulted you.
There's also the whole randomness aspect which wasn't present before.