I really think the all-in-one-ness of Flash is what made it so easy to use. Not only that you can make almost everything for a game/cartoon in one interface (II

I really think the all-in-one-ness of Flash is what made it so easy to use. Not only that you can make almost everything for a game/cartoon in one interface (IIRC audio wasn't included), but also that the output was a single file you could share easily. The rampant piracy of old Flash versions probably helped a lot too.