I mostly agree with this, but the trouble is (probably) that proc-macros are heavy-handed, inflexible, and not great for compile times. In this case, for examp

I mostly agree with this, but the trouble is (probably) that proc-macros are heavy-handed, inflexible, and not great for compile times. In this case, for example, it looks like the generated code needs global knowledge of related ORM types in the data model, and that just isn't supported by proc-macros. You could push some of that into the trait system, but it would be complex to the point where a custom DSL starts to look appealing. Proc-macros also cannot be run "offline", i.e. you can't commit their output to version control. They run every time the compiler runs, slowing down `cargo check` and rust-analyzer.