Not really. It was an open spec, but controlled solely by Adobe.
> Flash was designed, as its very first use case, for touch screen kiosks. So a lie.
Bullshit. It was originally release By FutureWorks(?) as a vector tool to run on PenPointOS - that failed, so they pivoted to use the core as an animation tool for the web. Macromedia bought it added extra functionality, including ‘actions’. Adobe acquired Macromedia, and Flash, in 2006 (if memory serves correct). I remember them stopping development of, the vastly superior to Illustrator (IMHO), Freehand. They release Flex, which you may be confusing with Flash as it was based on it, as a platform for enterprise apps. If there was any kiosk targeted features, they were very definitely and after thought. So no, not lies.
Lastly performance. Annecdata. It ground my laptop to a halt and my desktop sounded like a jet engine taking off. I used quite heavy 3D and cad programs at the time, and even they did hog resources like Flash did. Admittedly, total annecdata. But enough people at the time saw fit to complain about it.