Commentary, behind-the-scenes features, bloopers: What did we lose when we said goodbye to DVDs?

My wife and I have been visiting half Price books and thrift stores to find dvds and blurays.

Me because I like director/actor commentaries, and behind the scenes/making of features, her because she hates when streaming services cycle through content.

Also secretly I figure if the world ends and I'm somehow alive, I've got my solar setup and several ways to watch my favorite shows to escape the hellish reality that is post-apocalyptic earth as I slowly die from malnutrition or radiation. But that's like.... So far down the list, I usually just bring it up for the lols.