Thoughts on "HTML5 does not replace the best parts of flash"

I agree wholeheartedly with this Tweet thread. I get all the issues with Flash but is there anything comparable to Flash? Is there any program or platform that a 13-year-old kid, such as myself back in the day, could start making dumb animations with trying to be the next Homestar Runner and sprinkle a little ActionScript in as needed to make play and pause buttons, all the way up to building professional games? It seems like the motion graphics world is using AfterEffects and the development world is using JavaScript but there is nothing that effectively marries these things the way Flash did. Am I missing out on some fantastic motion graphics program?
Is this something that I need to dedicate the next decade of my life to building as an open-source project :exploding_head: :laughing: