There is a third option: make your language shine where it matters (to you), and accept subpar experience in areas that matter less. Specific things you mentioned — debugging, profiling & analysis — could be treated as a solved problem if you transpile your language into some other language that already has these nice-to-haves. JS is a wonderful target, as long as you generate something remotely readable you already have a way to debug it, no need to reinvent it. Instead, it's much more fun and beneficial to focus on the reason you want to create the language, on the features that make it stand out.