Bollocks. Flash was a security nightmare. It was an easily-exploited attack vector for endless viruses and malware.
It also only really worked on Windows and begrudgingly on MacOS. They snuck out a few Linux builds like a wet fart but they barely worked and weren't nearly as performant as the Windows flavor. Hope you liked your browser crashes!
Look I get it. You're one of those people who look at it from the IT side. But what he said was true. Flash fundamentally changed the face of the animation and gaming and IT industry.
It allowed an entire generation to have access to a toolset that let them make their own animations and games servable to web browsers, were the vast majority of software at the time was proprietary, expensive, and so highly specialized that you needed a course on it just to draw a line. (Try tweening in Toonz). Without flash we wouldn't have half the indie games that paved the way for crowdfunding, UGC Platforms, and Rich multimedia standards we take for granted on more secure platforms.
The greatest sin of adobe was that flash was never an open standard, so the nerds could troubleshoot it, fork it, and make better engines that are not so open ended. But realistically, no one has done that. I can still watch .swfs I saved 20 years ago, and watch crisp vector art.
Html5+Svg+js never went anywhere and was never a viable containerized solution, unityweb is a cancer, and now we are living in the hellhole of bloated webm streams of crappily converted vector art, on platforms which are increasingly narrowing the noose for anyone but the algorithm money printers.
That Adobe being involved in any standard to mandatorily metadata tag images is disgusting, just as much as Google trying to create authenticated WEB protocols to track and force ads on is disgusting.