It makes perfect sense to use Rust as the main language for your application but have areas which are either in the prototype stage, need to be written quicker or which simply don't need the performance. But Rust does not offer a way to enter such a less strict context and such proposals keep getting shot down by the community, even when they are made from core members of the Rust team.

Contrast that with C# which has a dynamic keyword, allows enabling a checked context (not just in code where you can't miss it but also from csproj), has reflection, etc.

I really want Rust to succeed but sometimes the attitude borders on zealotry.