My sense is that, once you get to a certain size of project, it becomes both impossible and undesirable for everyone in the project to be able to keep the whole

My sense is that, once you get to a certain size of project, it becomes both impossible and undesirable for everyone in the project to be able to keep the whole thing in their head. And that this boundary is something of an event horizon in terms of what's desirable in a coding style - up becomes down and down becomes up. There's also a lot of code that's so tightly coupled to some business domain that it's natural to write it in the language of the business. That way you don't have to maintain separate mental models and translate between them.