For instance, did you know, once upon a time, Microsoft Word (both Mac and Windows), had the ability to link up MS Word files so that you could have one document across multiple files, and word would maintain page numbering throughout the whole conceptual document. You could write a book where each chapter was its own separate Word doc, and MS Word would manage the page numbers for you so that they were continuous through the book.
And Microsoft did this specifically so you didn't have to load the entire damn book into memory to edit it. There are a lot of reasons you might not want to do that, such as conserving memory for performance, and protecting your work from corruption due to mishap.
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