20+ years ago, Lindows had a great app store that let you create an “aisle” of your favorite apps so if/when you’d reinstall your OS, instead of searching and installing all your apps one-by-one, you’d just go to your aisle, click “install all” and boom.
Is there anything that exists like that today?
You’re correct. All packages installed via dpkg/apt are on that list. What isn’t included are appimages, flatpacks, snaps and other non-dpkg software if you happen to have any.