Your tone makes it sound like this is a bad thing. But from a user’s perspective, I do want a distro to package as much software as possible. And it has nothing to do with user freedom. It’s all about being entitled as a user to have the world’s software conveniently packaged.
Software installed from your package manager is almost certainly provided as a binary already. You could package a .exe file and that should work everywhere WINE is installed.
What if you want to use a newer or older version of just one package without having to update or downgrade the entire goddamn universe? What if you need to use proprietary software?
I've had so much trouble with package managers that I'm not even sure they are a good idea to begin with.