I disagree. The IE6 of today is IE11, not Safari. Just look caniuse.come for practically any modern feature. It either requires you to pollute your code base

I disagree. The IE6 of today is IE11, not Safari. Just look caniuse.come for practically any modern feature. It either requires you to pollute your code base with polyfills or doesn't work at all. Every day bring another fun barrier. Today it was Promises (https://caniuse.com/#search=promise https://caniuse.com/#search=promise), tomorrow, I am sure, it'll be something else.