I would contend that you can't be great at being a software developer or building things quickly to solve problems if you don't understand the computer science taught in these courses.
You might be good, you might get some stuff done, but you won't be great.
I say this as someone who has been around this industry a while. You don't need a fancy degree from a fancy school, but you do need a solid basis in theory. Some of the best developers I know never went to college, but they did learn the theory on their own.
And some really poor developers did go to college, but their college didn't emphasize theory, and so they aren't very good when something happens just outside of what they learned, or a new problem presents itself.
You might be good, you might get some stuff done, but you won't be great.
I say this as someone who has been around this industry a while. You don't need a fancy degree from a fancy school, but you do need a solid basis in theory. Some of the best developers I know never went to college, but they did learn the theory on their own.
And some really poor developers did go to college, but their college didn't emphasize theory, and so they aren't very good when something happens just outside of what they learned, or a new problem presents itself.