As a programmer myself, I have the most to say about this.
I hate programmers because 99% of them are touch-starved, socially-constipated nerds who think that because they can solve a hard math problem that they are smarter and better than the thousands of years of social development that came before them. And so, they sit there, smugly destroying all of it because they are—and I'm being serious—too stupid to know what they're breaking.
You don't know why you should own a function that composes other functions you didn't write? I'm not even going to give you the answer. Just, see if you can figure out a way that might work.