I suppose, but that seems like a natural consequence of C#'s desire to move the language "forward" in terms of implementing new features (such as switch express

I suppose, but that seems like a natural consequence of C#'s desire to move the language "forward" in terms of implementing new features (such as switch expressions or non-nullable reference types) while also maintaining backwards compatibility (for example, you can still use the non-generic "ICollection" interface if you want to). Just a different set of priorities.