That's an interesting assertion but does not hold to reality. Nearly every single modern Go library leverages Generics in some manner AFAIK. It is a feature primarily meant for library authors anyways. Go generics are still limited - nowhere as powerful as Rust/C++ or even Java's generics. Primarily because they added it too late and ran into considerable trouble, instead of upfront thinking about the design.

Interfaces however are far more fundamental. Any app with components and modularization would declare intent through interfaces. Not having interfaces/traits as a language feature is like living without a hand or leg. Sure you can limp and hop, but it will get rather tiresome.