On ships, its different as there is a hierarchy and space can be a bit tight... but I still fail to see how shoving ensigns into walls of the corridors would be considered 'decent' or 'high quality standard of living'.
Like I said, you can give them shuttle bay sized room, and cram a large amount of bunk pods into that section and make it communal with facilities for lower decks (aka, cadets and ensigns) and make it NICE.. .as opposed to having them literally in corridors.
Space is not that tight even of Cali class ships... and the saucers are HUGE when you think about it... so higher living standards would definitely be doable even for ensigns and cadets on those ships if SF just made things in a more sensible capacity.