They're different problems, you've got programming in the small, medium and large.
Computer Science tends to focus on programming in the small to medium, and software engineering tends to focus more on programming in the medium to large.
It's one thing to optimize a small piece of functionality fully, but it's another thing to put together a product that has thousands of live users, hundreds of features, multitude of configuration modes, distributed globally, etc.
If I ask you to clean a bathroom in 3 hours, and then I ask you to clean the whole house in 3 hours, your approach to the cleaning will be very different between the two, and the first thing that will be cut is your attention to details.
Computer Science tends to focus on programming in the small to medium, and software engineering tends to focus more on programming in the medium to large.
It's one thing to optimize a small piece of functionality fully, but it's another thing to put together a product that has thousands of live users, hundreds of features, multitude of configuration modes, distributed globally, etc.
If I ask you to clean a bathroom in 3 hours, and then I ask you to clean the whole house in 3 hours, your approach to the cleaning will be very different between the two, and the first thing that will be cut is your attention to details.