I second everything except the fact that Adobe was behind Flash, which IMO is what killed it in the first place (with ten years of hindsight, I can say this confidently). I still do creative, non-standard work, but in a free way using pure vanilla JS (using Haxe). Adobe's mistake was keeping the system proprietary instead of letting it be free. Since then, I've left that ecosystem and what a relief!

(I know I'm mixing different levels here, and my personal experience isn't really an argument).

ps: HTML scope is way more advanced than whatever Flash could have been.