Poor bracketing almost always causes syntax or compiler errors. As long as you have a language that's block-scoped (which is true of modern JavaScript and most other popular languages), you'll get an error if you make a bracketing mistake.

That's not true of indent mistakes. Semantic whitespace is lossy -- there's data contained in those brackets that some people think is low-value that it's expendable for the sake of saving keystrokes, but it does have value in practice.