I think the example still works because, while it is not too complicated to understand, it is also non-trivial. It's also probably more complicated than the ty

I think the example still works because, while it is not too complicated to understand, it is also non-trivial. It's also probably more complicated than the typical non-technical person would think. It's also worth mentioning that this diagram doesn't capture dataflow or the relationships between the subsystems needed to make this work. The logic for notifications requires interaction with user preferences, channel membership, comment parsing, thread management, and more[0]. All told, you may still be looking at (low) thousands of lines of code, with maybe 1.5-2x times that amount for test code. [0] I'm just guessing how the app is structured internally. I have no idea what it is actually like.