You can lend them. Have a friend over and find out they have never seen <insert meaningful show or movie here> before?! No need to quick search and figure out if it's on a streaming service they have, just walk over and snatch it off your shelf and hand it to them.
In the 00s the trade in media lending was so brisk my friends and I would keep spreadsheets and little databases of who-borrowed-what-from-whom. There's even a DVD little lending library in my neighborhood. Not to mention the public library system has tons of physical media to choose from.
I love streaming and rarely turn to physical media these days, but as my kids get older and want to watch the same things over-and-over-and-over... building that DVD collection out again is looking really appealing.