I just wish someone had made a good Flash/ActionScript3 -> JS+HTML-Canvas compiler. There's no reason we couldn't have kept the authoring tools just because we got rid of runtime and all its security issues.
If Adobe had seen their ban from the iPhone as a challenge to make Flash player capable of running without a plug-in they would dominate so many areas today. Flex would have become a viable platform to develop web apps/PWAs with - effectively sitting in the same position as what Flutter is doing today (Although I don’t believe Flutter is a one size fits all universal toolkit). I suppose they tried with PhoneGap but without Flash/Flex, which was their super power, they just didn’t have enough value proposition.
I suspect they saw the desktop install base of Flash Player as too important to risk loosing by marking it redundant - innovator's dilemma.
For some reason they just excepted defeat with Flash.
The runtime has too much baggage, and Adobe is it’s own worst enemy to keep AnimateCc alive. Instead I would prefer someone rebuild a subset of the authoring tool that sufficiently captures the essence of Flash, with multi-platform targets (including WebGL). I say rebuild Macromedia Flash 5, but with a JavaScript coding environment, and you would have a successful product.