Serious question: why could not those other devs learn from your Rust code, even decompile wasm back into it via their devtools and ye olde view source?
Because the source-map may not be available. And they might not know Rust. Or perhaps having to setup a Rust dev env to play with this code is too much work and it's just not worth it.
I'm suggesting that when debugging optimized code, you'll use -g as on native platforms. I'm speculating further that with wasm, decompilers will rise to the view source challenge.