As someone that works on rust-analyzer, complex proc macros do slow down things but complex macro_rules much more. And they're also much more complicated to und

As someone that works on rust-analyzer, complex proc macros do slow down things but complex macro_rules much more. And they're also much more complicated to understand. If you can skip `syn` or `quote` by this, for sure do it (although they probably will be included anyway by other crates). But if not, it's not worth a lot.