The Galaxy class may seem too large to be a cruiser, but naval classification follows role and operating pattern rather than a universal size ladder. In exploration contexts, cruisers could be larger than battleships because range, stores, laboratories, and habitability consumed volume. A very large ship can remain a cruiser when independent movement and multipurpose cruising define its work.
Notable Point · 1:34:57-1:35:25
Why size alone does not make a battleship
The Galaxy class's enormous volume does not settle its classification because historical cruisers built for distant exploration could also exceed battleships in size.