I think the days of needing a HDD in your PC are kind of over. Most "normal" users will not have any music library to speak of these days, and certainly no video library. They stream music from Spotify or Apple music, use streaming radio services and so on. In terms of video most users have Netflix, Amazon Video, Youtube, Hulu, some other streaming service or combination of streaming services that they watch video from.
Yeah you sometimes download Game of Thrones to your PC and watch it, but I don't think archiving it on a HDD is really a good use of anyone's time these days, when you could just download it again in 2 minutes if you wanted to watch it again for some reason. I tend to just delete stuff now as soon as I've watched it.
So it got me thinking, what's the point of a big HDD in a computer? I don't think there really is one.
The idea of a "comprehensive gaming library" is also kind of outdated. Even if you're a huge gaming nut, you don't need more than 5 or 6 games installed at any one time, and if you do run out of space, just delete some games and re-download on Steam when you want to play them again. With connection speeds the way they are, it makes little sense to archive hundreds of gigabytes of games that you don't even play, "just in case", when Steam does that for you already.