The discussion places ships along a spectrum from battlecruiser through fast battleship to battleship. It treats Vanguard and Iowa as fast battleships despite their speed, while allowing that relative comparisons can shift when heavier designs such as Montana are included.
Notable Point · 33:53
Battlecruiser is a spectrum, not a fixed box
Vanguard and the Iowa class illustrate why battlecruiser and fast-battleship labels cannot be applied as rigid categories.