Comment by marhee

I suspect it's part of the fun? A way to really learn something?

There's also another hint:

// THIS FILE WAS AUTO-GENERATED. // CHANGES WILL NOT BE PROPAGATED. // ----------------------------------------------------------------------------

(Of course this could be a result of something having nothing to do with the contents of the file, but maybe the author has to meta library that can generate the types in different languages).

There seems to be fixed-precision variants of the vector types as well which seems to be not available in the .NET framework.

Plus, of course, you can't add your specifics needs to library types (like the fixed precision). They are closed to modification.

I am just guessing, of course.

That being said, it would also make total sense to use the .NET types.