Earlier quoted context omitted.
A lot went downhill after Adobe bought Macromedia. Flash use to be light weight, small and incredibly good for displaying vector graphics. You can scale up older Flash content to 1080p and it still looks great. You can't do that with YouTube videos of older flash content. Many animation studios still use Flash .. to make their YouTube videos. It ran on three platforms (Mac, Linux, Win) and was a much better portable…
I don't know about Linux, but back when Flash was relevant the Mac version always felt like an inefficient crashy dumpster fire to me. I don't have a source to back this up, but I always assumed that was a big part of why Jobs was so uninterested in supporting it on iOS.
Then Jobs wrote "Thoughts on Flash" and magically a month or so later the Mac version ran a ton better and continued to get better for about a year.
Have little sympathy for such a reactionary approach to user experience when the majority of Flash authoring occurred in ad agencies running Macs.