I started with dynamic languages, ruby is my favorite, and I use it everywhere where it’s suitable. As I observe, over years static languages getting abit more dynamic or less explicit (as they can), and dynamic languages getting some support for type checking. I guess having both in one language would be a best thing. So when code gets larger or I want to be more confident in some part I can add type validation (it could be a code that run as shared library, or communication between modules)

I also think that parameter strong typing and splitting code into service helps to design better, more clear messaging between components. Having done that for some time we can train ourselves to always pay attention to it, and it will help up to build larger code bases in a maintainable way. (I think larger code bases are more efficient from “time spent” point of view)

I often see people do same mistake: they trying very hard not to repeat themselves, and the highly reusable functions become very dangerous piece to refactor. I would rather have code copied in different modules, unless it’s very general thing that never change like array sorting or date formatting