I don't follow your comparison. What parts of the Linux ecosystem have a single person maintaining a large multitude of packages?

Looking at the kernel itself you see a hierarchy where people are only responsible for small segments of the kernel.

Looking at a standard distro like Debian, which makes this easily available at https://www.debian.org/devel/people you'll see that most individuals are only responsible for a handfull of packages, with the bulk having a team responsible for them.