Earlier quoted context omitted.
I think it's taken for granted just how good flash was. It gets hated on a lot because it was proprietary and insecure, but it's really impressive that they had a system where teenagers could make genuinely good games and animations, and then play them in web browsers on machines with Pentium IIs. There's nothing else like that today.
Flash created a medium. The particular genius of the authoring tool gave rise to a whole style of animation and game and thing-in-between that only existed in its time and could have only been created with the tool at hand. Software should aspire to this.
Since Flash was an animation-first piece of software that still had a fairly robust scripting system, it was able to create very unique and interesting pieces of media that can kind of only exist as they are.
People aren't making full on TV cartoons in Construct or GameMaker. This isn't a dig at those tools, they're good software, but the animation parts of them are targeted much more towards "animation for games".