wasm's true goal is to bring more performance and technology-independence to the web, which leads to more decentralization, user power, etc. For instance, more things can "run everywhere" because the performance is acceptable in a browser and so writing native applications for individual platforms isn't necessary. Moving things to the web becomes much easier because it is easy to retarget existing code in native languages without having to rewrite it all. And, importantly for freedom, those mean more things can be freely accessible webapps rather than having to go through the mobile vendors' stores and vetting.

All of these benefits come without a significant cost to user freedom because the cost has already been paid, and will always be paid no matter the underlying technology: companies will always ship obfuscated code if they feel that's important. (Also, I suspect most minification is driven by bandwidth and page speed concerns.)

Lastly, I don't think wasm is actually noticeably more convenient: shipping wasm requires a compilation step, just like minifying JS.