"Sorry, I got to return this video"
"Mike? I love that guy, I got him on speed dial"
"Do you have any quarters for a phone?"
"Bill Cosby really is America's dad"
"Can I borrow that VHS?"
"Sorry, I can't come. My favourite show is on"
"Do you know where a phone is?"
Why would you want a DVD over streaming it?
If you borrow a DVD from the library for free you don’t need to pay for whatever streaming service is holding that particular film hostage, if it’s even available at all. And if it’s a Blu-ray Disc it will have better picture quality than a compressed stream. Making copies is also very easy if you have a computer with a drive, and doesn’t require paying for a VPN to avoid facing the risks of online piracy.
Young kids, you want the least amount of confusion and you don't want to buy them a tablet that you have to maintain/load up with videos to watch.
Eventually there are better options, but there was a window of age that DVDs made all the sense.