"but you can still play old flash games with internet archive and flashpoint" yes, but preservation of history can only go so far if it can't be built upon, making new flash files is no longer viable, forcing people today to start from scratch. nothing so far has replaced flash
also, good example of how "html5 and js will do everything flash/shockwave do" is wrong. if you look at today's offerings they look more primitive than 20 years ago. i'm gonna go on a limb and compare the death of flash as a web setback akin to a small scale library of Alexandria