The writing culture is very real, and when done correctly is fantastic. But it worked because it is harder to write than it is to get up in front of bullet points and waffle out a one hour presentation.
Writing is hard because it really forces you to think. Clearly articulating thoughts means clearly thinking to begin with.
I suspect the lower level doc reviews are going to be filled with a lot of AI slop, but I would expect that presenting a sloppy document to an exec would be met with a "what is this" a swift exit from the room just as it always has.