With the death of Flash comes the loss of a huge part of internet cultural history, mostly interactive parts - as at least flash cartoons can be rendered to video and put up on YouTube. There were a lot of innovative games and concepts on sites like MiniClip and Newgrounds.

I remember seeing a very early demo of a <canvas>-based SWF player shortly after the iPhone came out - I wonder what would have happened to Flash if Adobe, Apple, or Google put effort into making it work the same way they did with the JavaScript-based PDF renderer.