I miss usenet and webchats, mostly, and the fact that communities were smaller and you could feel you could actually contribute. Now it feels like you can already find what you wanted to say. And the opposite of it.
What I Definitely don't miss is: popup with ads, the <blink> HTML Tag, the "under construction" images on websites that would never be updated ever again, and images that would take minutes to download.
What I know I will miss from 2020 in 10 years: contents written by actual humans instead of AI.
When a basic dynamic library needs to be updated because, for instance, there is a big security issue, then all your statically linked binaries will have to be updated. Which means every one of those developer teams need to keep track of all the security fixes, release a new version of the binary and push it, and every user will have to download gigabytes and gigabytes of data.
While if you have dynamic libs you only have to download that one, and the fix will be pushed earlier and all the apps will benefit from it.