The creation tool still exists (it's been renamed to Adobe Animate) and even still lets you make interactive content with, I can only assume, a similar workflow. But what I really can't understand or forgive is that Adobe killed ActionScript, replacing it with a JavaScript library (CreateJS) that's similar but not quite the same AIUI. That meant you can't just re-export existing Flash content for HTML5, and Flash creators' existing skillsets aren't directly applicable to the new system…

There's no good technical justification for this. Adobe could have ported Flash Player to WebAssembly or asm.js, or they could have written an ActionScript to JavaScript compiler and a set of support routines. They could have gotten even very complex old Flash projects working on HTML5, they could have charged money for this feature, and many people would have forked out for it! Instead they were content to let their platform die. It makes no sense.