It was the player that wasn’t great.
This however also lead to an abuse and for a while you had websites, fully in flash which broke so many things (deep linking/bookamrks, browser history, etc.) combined with unintuitive navigation and slowness due to animations ... plain overuse of an otherwise good technology.
Truly we have failed to learn from past mistakes.
I took a 3 year break from anything Frontend. Felt like I had gone through a time machine.
And the standard libraries, cross-platform support, and industry-trailing IDE. They didn't even have a stable debugger for years but that didn't stop them from charging $800/seat to see if they'd fixed any of the problems.
(i'm interpreting 'flash websites' as 'websites made in flash'. i'm not referring to websites that contained flash applets.)
Most of the flash sites that I really remember consuming were actually very simple documents that relied on flash for presentation, so it would be easy to provide a screen reader friendly version of the content.
Also a lot of flash content was cartoons and games which don't lend themselves to screen readers anyway.
So your solution is to dig the hole even deeper?
He he, that's a funny link. We know the end-state of absolutely unfettered capitalism :-)
We've had it, that's why they invented the guillotine. It was called "feudalism".