Plugins are made by all different people. It's a big hassle to get all the latest plugins available and bind them together. If one of the creators of an individual plugin makes an update, the package needs to be recompiled. The package will never contain all the latest updates (and plugins for that matter). Also some plugins don't work together. Or some plugins work only on certain MSN Messenger versions or on certain Windows OS's.
Binding all the plugins together defeats the purpose of plugins...
BTW: Edit your last post if you want to add something. Do not double post, this is
not allowed!