ubuntu and a multithreaded package manager

[LSparky]

Onebase supports multithreaded package management using both source and binary packages. I was just wondering how come ubuntu doesnt do this too? How come ubuntu isnt a source based distribution? How come ubuntu doesnt use something like portage?

http://en.wikipedia.org/wiki/Onebase_Linux

http://en.wikipedia.org/wiki/Portage_%28software%29