This is just something I've never understood. What is taking up that 2.17GB??? Are they just recompiling every shared library or something? How is it that the

This is just something I've never understood. What is taking up that 2.17GB??? Are they just recompiling every shared library or something? How is it that their updates (even on iOS) are so massive even if they don't include (or need to include) new graphics, etc.