[nar001]

I remember seeing stories about Adobe not being able to, or not wanting to, write a good energy efficient flash renderer for the iPhone, thus being another reason not to support it for Jobs (Adobe being of the mind that "Flash is so big, they'll have to support it" and Jobs proving otherwise)

[tracker1]

Forget efficient.. they couldn't manage to create a Flash that didn't crash your browser or have gaping security holes discovered left and right.

[ascagnel_]

They also either could not or would not write efficient Flash clients on Mac OS or Linux, while the Windows version was fine.

I bounced around a lot between the three OSes at that time, and Flash was bad enough on the other two that I would almost automatically reach for Windows when I had to use it.