https://marco.org/2007/10/05/the-iphone-as-of-today-isnt-for-you-if-you-feel
The iPhone, as of today, isn’t for you if you feel you must be able to install and modify software on it. There are all sorts of other devices that are, at heart, technically, computers, but which aren’t sold or promoted or marketed as such. Like say, TiVos. And iPods.