Software is so bad because it’s so complex, and because it’s trying to talk to other programs on the same computer, or over connections to other computers. Even your computer is kind of more than one computer, boxes within boxes, and each one of those computers is full of little programs trying to coordinate their actions and talk to each other. Computers have gotten incredibly complex, while people have remained the same gray mud with pretensions of godhood. Your average piece-of-shit Windows desktop is so complex that no one person on Earth really knows what all of it is doing, or how.