A question to game devs : which design/architecture patterns do you use ?

Everytime I try to take a look at game development, I feel like there is a lack of guidelines, mostly about architecture.

It's something strange to me as a web dev, as we use much of these patterns on a daily basis. Of course I think about the near omnipresence of MVC and its variants, but not just that. Most of frameworks we do use are essentially focused on architecture, and we litterally have access to unlimited tutorials and resources about how to structure code depending on projects types ans needs.

Let's say I want to code a 2D RPG. This has been done millions of time across the world now. So I assume there should be guidelines and patterns about how to structure your code basis and how to achieve practical use-cases (like the best way to manage hero experience for example, or how to code a turn-based battle system). However I feel these are much harder to find and identify than the equivalent guidelines in the web dev world.

And the old-school RPG case is just an example. I feel the same about puzzle games or 3D games... Sure there are some frameworks and tools but they seems to focus more on physics engine and graphic features than code architecture. There are many tutorials too, but they are actually reinforcing my feeling : like if every game developer (at least every game company) has his on guidelines and methods and doesn't share much.

So... Am I wrong ? Hope to.

What are the tools and patterns you can reuse on many projects ? Where can I find proper game architectures guidelines that reached consensus ?

I'm dreaming about an assistant system, which is omnipresent.
Popping up on screens in public, sitting in many ear listening to my speech, with my personal feed off contextbased information.
Like a juxtaposition of Wikipedia, Facebook, Twitter, etc...

I don't want to pick my device from my pocket to type in a search or to push a button and say "ok buddy".

It just have to be omnipresent and focused on my requests.