Earlier quoted context omitted.
> Flash as a technology should never be used now unless for artistic purposes. Nothing filled the gap left by Flash. It was easy, accessible, and drew so many young people to create. Flash had security issues, but they could have been fixed. Macromedia and/or Adobe could (and should) have published an open source standard and realized their tooling would always be ahead of the game. They didn't see the incredible opp…
You are romanticizing Flash. One legitimate reason for it's eventual demise was due to the fact that it was very power hungry to run. On laptops that was bad, and on smartphones it would have been a non-starter. Though curiously, I remember that some smartphones did used to come with Flash like the Blackberry Z30 which had it through 10.2 and then it was taken away out of the hands of the device owners in 10.3
Apple realized very early on that you needed hardware acceleration for common computing tasks in order to have laptops that last more than an hour on a single charge. It took Adobe several years after the launch of the iPhone to actually support some amount of hardware accelerated video decode, and as far as I'm aware vector rendering (the core of the platform) was never meaningfully accelerated. As far as I'm aware, pre-iPhone efforts to get onto phones involved a special cut-down Flash runtime that was perpetually out-of-date and was only really popular on early-2000s Japanese handsets. This wasn't at all built for the "computer in your pocket" that Jobs wanted.