> But this should be up and front in their self-promotion!

It is! "A fresh approach to metaprogramming based on compile-time code execution and lazy evaluation" is the second selling point after simplicity: https://ziglang.org

Obviously, they can't call it partial evaluation because not many people know what that is. Zig's approach was eye opening to me. I'm very familiar with how macros are used in Scheme, but comptime is intentionally weaker (unlike macros, it's referentially transparent, so strictly weaker) and I was surprised by just how far it can go. It's not everyday that you see a new kind of a partial evaluation construct, let alone a language that's almost entirely based on it (like Lisp only for comptime).