I know almost no professionals who write their own sorting algorithms. Instead they use their language’s standard library. However, I wouldn’t want to hire an

I know almost no professionals who write their own sorting algorithms. Instead they use their language’s standard library. However, I wouldn’t want to hire an engineer who can’t write pseudocode for sorting algorithms or explain space/time trade offs. It is the same for photography. Many photographers never shoot full manual, but I wouldn’t want to hire a photographer who doesn’t understand what makes an exposure and wouldn’t be able to shoot manual if they really had to.