@thelinuxEXP Something you didn't mention is offline installs. Basically it's very easy to create a USB / DVD / BD for all Debian packages based on a distro version, and you can apt install, which will ask you to insert the right media. I think RPM etc have the same feature.
Flatpak et al, I believe, are online only. You can technically put together a flatpak side-load thingie but I have no idea how plausible that is in reality.