I spent a large chunk of my early career in organizations that were very document-focused.
It was expected that you would write documents.
It was expected that you read the documents that others wrote.
It was expected that time be scheduled during meetings to ensure the document was read.
It was understood that in order to arrive at the intended understanding that you read all the words.
If a short summary could have conveyed the same information, the author would have written that instead.