Regardless of whether you are pursuing the main plot, or choose to just explore and do other quests, they are still a story. Going deep into a Dwemer ruin to retrieve an artefact IS a story. With storytelling comes purpose, a sense of motivation as to WHY your character seeks the things he/she does, and the deeper the storytelling, the deeper the purpose and the more alive and real your character will feel. The books are there, the clues in the shape of remains and letters are there and people seem to appreciate them, so I see no reason not to build further upon the storytelling by adding visuals an impressive cinematics where appropriate, not to replace what is already there and good.
All true, but does it really need videos in a game that is a video in itself, a video game? What stops it from becoming a "Sims with videos"?
If one does not want to know about the background of some of the things, why does it need to tell them in a video? And why does it need a video for those who do pick up the books?
I still do not see how "a nice touch" becomes meaningful. It will cost Bethesda a lot of money to make these videos and they will take a lot of disc space, too. If these were done with just the 3D engine then it might not even be worth watching. I have seen games that have tried this and I just end up pressing the ESC-key to get them off my screen.
There are movies that tell you a non-linear story, like what happened 6 months ago or what will happen in a week from now. The TV series
LOST made this almost into an art. Yet, I do like a movie with just one linear story better if the story gets told well. The back and forth in time in some movies remind me more of a confused story teller who fails to put all the pieces together into one linear story.
Besides, I never wanted to know what happened to the Dwemer. I like the mystery around them and not knowing what happened there. I would hate to see a video about them.