It's another thing entirely to make a "rocket" that will take a human being to space, or to school, or to work, or to the mall, or to the bank, or to church on sundays. And also it functions as a TV, a telephone, a radio, an encyclopedia, a games console, or anything else one can imagine. And then you wrap that up in a user interface that my grandmother can use without a NASA astronaut's level of training (YMMV).