Nothing, besides probably 2-3 times a year when I get Prime when I'm buying things, so strictly for delivery, if it's worth keeping and re-watching forever, so for example LOTR trilogy, classic cinema etc I buy 4K UHD Blu Ray, that way it's mine.
I buy plenty of older films, comedy greats, docu's on cheaper BR or just old DVD.
Yeah, I did at one time think that streaming would offer a forever library of greats at my fingertips, but that's just not the case, it's become little more than popping down the old video shop and renting some VHS tapes (the picture quality with streaming and SKY is laughable). I'm reminded of the huge error I made when largely disposing of my vinyl collection, and old time Hi-Fi system, to go with Cd's (ugh), I think portable music obviously has a lot going for it though, with Spotfiy etc.
In the end, as I found with books, after I tried Kindle, physical media just has a magic to it you can't recreate with convenience. And of course it's yours forever.