Isn't that the point of http://requirejs.org/ and the AMD API - http://requirejs.org/docs/whyamd.html ? Why is there not more of a push for frameworks and libraries to be AMD compatible? The Dojo Toolkit is, and thus lets you load just what you need.
i think of it more as systemd than apt. calling it a package manager isn't all that accurate.
Scroll down to the "Module Loaders" section at http://todomvc.com/ I don't see any of the products listed you mentioned.
Notice that require.js works with Backbone.js, Ember.js, Knockout, AngularJS, Ember.js, Knockout, AngularJS, CanJS.
TroopJS uses require.js. The only major competition it has is Thorax + Lumbar or Twitter's Flight.
