Why did different turret heights matter?

Why should small differences in turret height matter when salvo dispersion is larger?

At long range, different gun heights add meaningful complexity to manual firing calculations even when the difference seems small close up.

Height differences become significant at ranges approaching 28,000 yards, where small changes in the guns' starting geometry affect the solution. Modern game assistance hides that work, but historical crews had to account for it without digital computation. Keeping turrets on one or two levels therefore simplified a demanding long-range gunnery problem.