I get the impression that feature for feature, ES6 is identical because AS3 and AS4 were build on ES. I remember reading performance is better today, but can’t find the stats on that.

It’s the “creation experience” that has never been matched.

Of course, it depends on who you are - For true coders, the current systems are fine and in many ways better, but for wholistic visual first creatives, who may also code well, the current tool sets are totally lacking.