You can still write ES5 and it will work in the latest JS runtimes, so I'm not sure how this is different. Further, indeed the newer JS features do in fact giv

You can still write ES5 and it will work in the latest JS runtimes, so I'm not sure how this is different. Further, indeed the newer JS features do in fact give you better compile time analysis, warnings, etc, and result in slightly better code.