The way I describe language types to non-coders inquiring about language selection for a given project is simply “scale matters”… dynamic types provide flexibility at small scale, but can very easily result in chaos at a large scale. Conversely, the structure of static types can feel onerous and restrictive at small scale, but provide robustness and structure at large scale.
If you mean codebase complexity and team size... then yes... types is more helpful with that. But in a small team with a small codebase you don't need types to do really well. I find types helped a lot when multiple teams were responsible for different domain spaces inside different components of a Rails app. I never saw the same advantage in codebases that are much smaller with fewer people.
