Atomic distros are cool, and I’m sure they will only get more popular, but I don’t buy the idea that they’re “The” future. They have their place, but they can’t really completely replace traditional distros. Not every new thing needs to kill everything that came before it.
No you weren’t. That would be ridiculous. The deb dependencies are most of your Linux install. Maybe counting just the new dependencies being installed alongside a typical deb install, but that’s still not an apples to apples comparison to 100% of all the flatpak dependencies, even ones shared with other flatpaks, and even that’s still very rarely over 1GB.