C#8 introduces default interface method implementations, so it wont need to be slowed down as a breaking change like on v8 https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/proposals/csharp-8.0/default-interface-methods#:~:text=Default%20interface%20methods%20enable%20an,)%2C%20which%20support%20similar%20features.