Indeed. We have to now think of JS dev for the web as something like a Universal build and dispense with trying to code for the oldest version. I know JS is JI

Indeed. We have to now think of JS dev for the web as something like a Universal build and dispense with trying to code for the oldest version. I know JS is JIT, but with tools like Babel and webpack and sourcemapping, that doesn’t mean we have to write the same code that’s executed. New code is so much more resilient. Remember: this is what we evolved to.