The updated game makes pitch and roll more visible constraints when a ship is being designed. A ballast control would provide a direct way to correct those characteristics after choosing the hull, machinery, and fittings. Real ships use ballast as part of trim and stability management. Its absence leaves the player without an equivalent adjustment when the design calculation produces poor behaviour.
Notable Point · 1:02:42-1:03:16
Ballast is the missing control in the game's stability model
A discussion of the updated stability model identifies adjustable ballast as a practical missing tool for correcting ship behavior.