My impression here is that (1) you don't want a language that you'd have to ship a runtime with (any interpreted language, Go, Swift), (2) Rust WASM tooling/doc

My impression here is that (1) you don't want a language that you'd have to ship a runtime with (any interpreted language, Go, Swift), (2) Rust WASM tooling/documentation is (much?) better than tooling for other languages, and (3) most people would prefer memory safety when it comes to a purely memory-safety-to-compile-time trade-off.