> You need a tool like this to monitor run-time browser errors. When browsers support a language that catches 100% of errors at compile time then you won't need tools like this.

Eh, I don't think that logging runtime-in-the browser is the value added here. I can wrap my codebase in a try-catch that catches exceptions and calls home with the stack trace in < 100 lines of code. Avoiding that < 100 lines of code isn't the value added.