In my experience with growing companies, even compay-critical code bases get rewritten within 3-4 years to account for flexibility that the previous strongly-ty

In my experience with growing companies, even compay-critical code bases get rewritten within 3-4 years to account for flexibility that the previous strongly-typed system just can't handle. A well designed system uses strong types for the "knowns" but allows changes via dynamic types for the "unknowns". Those are the systems that last.