In addition, movies don’t end up on Netflix until after they’ve been out on DVD for a while, so if you want to be able to watch a new movie sooner, you need to watch it on DVD.
While Netflix, and other streaming services people have access to, have a massive amount of content available, they don’t have everything and a lot more is available via DVD.
While it’s a bit surprising that so many people still rent DVDs from Netflix, it certainly makes some sense.
While it doesn’t give you the ability to watch whatever you want right now, if you get a particular desire to watch an old favorite that isn’t available online, you can have it in a couple days.