Hello, CptMonkeyFist
Please note, that there aren’t any all-purpose strategies regarding gameplay modules implementation. Decisions in this context (for example whether you should split a game into a lot of modules etc.) depend on a lot of factors, such as game genre, target platforms, performance, preferences of the developer, requirements of clients, convenience and so on and are made with respect to each individual case.
Thus, I would advice you to start with forming more concrete concepts for your game in terms of factors mentioned earlier. After this you can check some similar examples and finally make your own decisions concerning particular solutions.
Hope this helped! Cheers!