I feel like this article is severely flawed.
Debugging wasm qt apps is not hard at all. Yes, as the article says, you need to build the code in debug mode, this isn’t unusual.
If you use qtcreator, it’s, and I hate this word, trivial. Most of the work comes from setting up the qt kit in qtcreator… which takes about 5 minutes.
Breakpoints just work. Debugging just works. Everything… works.
I think you are disconnected from the pain of debugging in the past. The fact that it all works so seamlessly together now is a bit fascinating and astounding.