The difference between the smooth Flash trailers on Sony.com, the jerky episode of CSI, and the system locking Flash video on Fox.com is that the smoother ones were optimized specifically for phone playback. But if content providers have to go back and optimize their videos for mobile platforms, one of the key benefits of mobile Flash–backward compatibility with millions of existing videos–is lost. If you’re modifying your videos anyway, why not go the full monty and use an HTML 5 player instead of Flash?
via Mobile Flash Fail: Weak Android Player Proves Jobs Right