Except in, say, the D'deridex, Vor'cha, K't'inga, or Romulan scoutship classes. And, even if they are crewless, they're still space for starship systems.
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And again, its three dimensions cover 3 different size categories (as most ships in this system, i'd really love to know how they derived the different recommended spredads for each size category as I doubt a single ship in any of these books has all three dimensions fit within the alloted spreads for the size category in question, and I'd bet I can count the number that have two on both hands), I picked the size that best seemed the right balance of the three.