I believe they did say they aren't interested in giving much explanation to the finer details of multi-crew, it's meant to be pure game play.
That way lies madness. We can all invent reasons if it leads to problems sleeping at night but frontier have been purposefully vague in order to keep it as a game element, rather than highly technical and completely unintelligibly confusing mechanics.
Much like respawn after ship destruction. It's just sometimes better to not have a reason, than invent a rediculsouly implauisble one that no-one will buy. And because sometimes, just like pooping, we can just fill in the blanks ourselves, with whatever reasons we feel are needed.
Or not.
There are endless scientific reasons for many things that exist. We can't hope to know or understand them all. That we don't understand or know, doesn't prevent them from existing.
Presumably, we know in the 33rd century how it works because it's happening. Clearly it wouldn't if it couldn't.
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