In my opinion human beings also do not have unlimited cognitive context. When a person sits down to modify a codebase, they do not read every file in the codebase. Instead they rely on a combination of working memory and documentation to build the high-level and detailed context required to understand the particular components they are modifying or extending, and they make use of abstraction to simplify the context they need to build. The correct design of a coding LLM would require a similar approach to be effective.