Apple vs. Adobe – It’s about the framework…

What Apple does care about is their ability to control their own development cycles. iPhoneOS runs on extremely tight schedules, with a very high degree of secrecy, and at a pace completely controlled by Apple. … Imagine if 10% of the apps on iPhone came from Flash. If that was the case, then ensuring Flash didn’t break release to release would be a big deal, much bigger than any other compatibility issues.

Straight-forward explanation. Read this if you still don’t understand.