[vii]

There were plenty of platform specific problems with Flash. Steve Jobs famously ranted about it https://en.wikipedia.org/wiki/Thoughts_on_Flash

That said, cross platform compatibility is always going to be hard. I'm still amazed that Adobe let that platform die. It has taken so long and so much effort to recover equivalent functionality, and in some cases we are still lagging what Flash could do.

[on_and_off]

let's be honest, the fact that allowing flash would also allow webapps not controlled by apple to go on the platform was a huge factor.