You seem to be repeatedly straw-manning EpicEng without replying to what he/she is actually saying. Maybe I'm just seeing that because I agree, but writing a useful embedded application in javascript seems about 100x harder than any of the standard ways, teaches you nothing useful, and would have to be rewritten from the ground up to go into production. It's a legitimate concern, not an "I'm so much smarter than you" brag.