If you plan to maintain the application in the future, using MVC/MVP/MVVM patterns will reduce the cognitive load, allowing you to implement new features and fix bugs much faster. I also noticed that you started writing this small application from May 10 to September 13 (with 'First Production' commits on September 7), which is almost 4 months. However, such an application can usually be written within 1 month at most (with design patterns), even if the developer is a beginner. The further the application develops, the harder it will be to maintain, because too much refactoring will be required (large chunks of code will need to be deleted or replaced, which increases the risk of new bugs). In addition, inheritance is necessary so that, through polymorphism, implementations can be replaced without introducing new bugs and while extending functionality. In short, there needs to be a balance between inheritance and refactoring so that the application can be maintained for decades.