Explain Like I’m Five

Its more a human thing: you have a big thing many people are working together to build, you have to organize somehow and make sure the thing actually is being built and does what it needs to do. Good companies do have an overall plan and good communication.

SCRUM is just one of many ways of organizing a project. It in itself isn't really a programming thing even if it is most often used there, the general structure can work for just about every project that can be split in to multiple smaller tasks and sub-projects.

If your programming team is perpetual firefighting and chaos with nobody knowing their roles then that's a sign of a bad organization or a lousy management structure. The last company I worked at was very organized. Status meetings thrice a week, clear seperation of responsibility, a good team lead divying up tasks the cropped up, and good communication between programmers.

It's nearly impossible to plan. Sometimes a very difficult thing is done in minutes and then you want to add a simple button to the gui and it can take days in the worst case.

One time I had to add some kind of grayscale effect to a gui. Well, it was not supported by the gui system. So of course the boss told me to put it in there any way. It ended up taking days.

In the end it wasn't even shipped! At least if it was open source I could have shared the work. So ya, it can be super frustrating. Especially if crunching is expected because your boss thinks its your responsibility.