But you end up with compiled machine code by using a computer to compile your high level code into machine code. You tell that computer exactly how you want it

But you end up with compiled machine code by using a computer to compile your high level code into machine code. You tell that computer exactly how you want it to compile your code into machine code. So in the end the code still is for the computer first. I can write a basic function in 10 different ways that basically do the same, but have bugs or small differences in side effects that might not be obvious to a human reader at first glance. Languages just lack the expressiveness to explain those nuances, hence comments.