Using the same language for compile-time and run-time programming is compelling, but doing it properly requires using the same approaches that dependently typed languages use. Comptime is a bit half baked.

It's not just about writing imperative code that runs at compile time, the actual interesting comptime feature in Zig is that "types are comptime values", e.g. you can inspect types and build new types with regular (comptime) code. This is very different from the template/trait systems in C++ and Rust. What Zig's comptime system is missing is the ability to build functions bodies at comptime (e.g. some sort of comptime AST builder).