All of Adobe's products are from outside developers and have been for years. It is just not terribly touted about. Whether Adobe is the end all be all of innovation is not what causes them to win at the game. It is the fact that they have the money to stand their ground, just like Microsoft, and stand it till they beat out their competitors, or buy out their competitors, through a war of attrition. Also, as mentioned, it is that Adobe has gained a name as a product like that professional shops feel they can trust in and will approve purchases on.