Even after 10 years or so, when the tooling is good enough to match the debugging experience we have now, it won't be a moot issue. There will be a much more common problem where you want to examine/modify the source code for a site, and you can't, because that site only published the non-debug WASM. One of the things that keeps the web platform healthy is the way that client-side sources are pretty visible.

In response to "But JS can be obfuscated/minified" - Minified JS is still much easier to examine/modify than WASM, and it's really rare for a site to deliberately obfuscate their JS beyond minification.