I'm not sure the tech stack was ever to blame...people would have eventually fixed the bad parts of flash.
That's an issue with the web site, not the underlying technology.
> […] people would have eventually fixed the bad parts of flash.
The Flash plugin was a closed-source component. (Various attempts were made at open-source substitutes, but none ever reached a fully usable state.) The only people who could have "fixed the bad parts of Flash" were Adobe employees, and they didn't.
Which is funny, because for years Flash only ever ran well on Mac OS 9 in Internet Explorer 5. Any other browser/OS combo and you were looking at dropped frames, and/or audio that couldn't keep in sync with the video. It really was a tool for designers, and accordingly Mac OS was the platform that got the most love.
The amount of tech they’ve squandered or mismanaged or just plain destroyed is disgusting.
And over the last 10 years of being a monopoly they’ve just let their software rot and now it’s so janky to use, photoshop even freezes for 4 seconds when switching between selection tools these days.