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I'd been using entt in C++, and recently have been working on a wrapper for entt in Nim (since Nim can just generate C++ output, works fine with templates, and lets you even emit your own C++ code, this is doable), and found that Nim is quite ergonomic for ECS code: https://gist.github.com/nikki93/694524b8c007b4269c899b2e046b...

That's the entire main file for a simple demo with rectangles, some of which oscillate, and you can touch to remove (multitouch supported).

Macros or pure Rust is more verbose? I could parse your last sentence either way.

I had the impression macros are used to make code less verbose.

In legion the macro attributes are used as "labels" for parameters to configure resource types. Theres also the additional boilerplate of annotating the function with a `#[system]`.

Bevy ECS relies solely on the type system, which means these additional annotations are not necessary.