@kev > For example, the Telegram desktop app as a Flatpak is 783MB, whereas the DEB is just 21MB. That’s a massive difference!
Flatpak uses shared runtimes which are huge. Graphical app stores often shows total download size as a size of application. This confuse a lot of people. As before any flatpak app is installed no runtime is insalled as well. The app store shows sizes of every app that big. But actually they are not.