"Static generic types are lies" yes, and it doesn't matter that much. You got the safety at compile time and if you didn't do an unsafe cast then you preserved it.

The issue with primitive types and boxing is certainly noted. Hopefully Valhalla will address it and more.

The problem with reified generics is that the same variance model must be adopted by all guest languages on the runtime. Hence you basically don't see any guest languages on the CLR, and efforts by languages such as Scala to port to the CLR failed due to problems interoping with C#. I think one of the JVM engineers "pron" has discussed this multiple times.