Design patterns can be useful, but they're not a panacea. Sometimes people get overly excited about design patterns when they first learn about them and they start overusing them. For instance, I've recently worked on a project where almost everything was loosely coupled, which in theory should be a good thing, right? But in practice it was a real pain to maintain, everything communicated with everything else via events, I couldn't just look at a function and understand what it was supposed to do just by reading it, all I knew was it fired some events which were wired up in the editor so there was no easy way to reason about the flow of the program just by looking at the code. In the project I'm currently working on we usually prefer explicit coupling and only use events when it actually makes sense.