Honestly, it always goes back to the seven deadly sins. In this case, I’d say greed and gluttony are most relevant.

Like @pathos said, that’s the list from the previous step. Because you’re autoremoving, it will only remove packages that aren’t dependencies of any other packages still installed.

For anyone reading this on a Debian-based system, you can get a good start without risking removing anything important like this:

1. Run apt-mark showmanual, and copy any package names you don’t think you need into a list.
2. Run apt-mark auto <pkg1> <pkg2> ...
3. Run apt autoremove

Just install the Auto Tab Discard extension. After a certain amount of time it will replace your loaded tab with a (RAM-free) placeholder that reloads when you click it again. Me, my ADHD brain, and my 500 tabs can be at peace now.