Have you ever worked in a place where every function/field needed a comment? Most of those comments end up being “This is the <variable name>, or this does <method name>”. Beyond, being useless, those comments are counter productive. The amount of screen space they take up (even if greyed out by the IDE) significantly hurts legability.
1 line of code?
Amateur, I changed 1 byte of code in the Linux kernel!
It was random driver with something along the lines of “if (hardware_version > 3) fail()”.
One day we got a new shipment of hardware that wasn’t working for some reason until I upped that 3 to a 4.