[Someone]

"It [...] doesn't require that the .NET framework be installed."

Are you sure? You still need the standard libraries, a garbage collector, its security checks when loading other code, and may want to use its compiler from your code. Together, that's a lot, maybe all, of what's in the framework.

[tracker1]

The standard library base is huge... they already split things into a desktop and full profile for the .Net installer. This will only need to include those portions of the library your app actually uses, which is generally a pretty small part (including GC). Not to mention future versions of the .Net runtime not needing to be installed on the target machine.