The most important feature of a tool meant to support creativity is interactivity. Last time I checked, Rust didn't have a REPL, didn't support live-patching, and didn't have fast compile times - all features critical for interactivity. Has something changed since then?

Also, while cold compile times can be very slow of you have a lot of dependencies with macros etc, incremental compile time is often very fast. Rust has one of the most advanced incremental compilers out there. So for experimenting, tweaking and updating code, that's not going to have a long cycle.