> Even if the battery on the original iPhone could have stood the strain, none of the flash games that existed at the time would have been any fun at all on the phone's tiny screen.

This is still true today - there are very few fun games you can run on a phone. The primary problem is that phones only offer a single control, touching the screen.

I constantly have problems with the crossword puzzle app I have installed on my phone, because I can't reliably touch the right letters on the on-screen keyboard. Flash isn't the problem with putting games on a phone. Flash was a tool that people used to make fun games, but making fun games is pointless if you want people to try to play them on a phone.