Code explains the what but not the why. And even then, the what might not be so clearly obvious. This is one of those blindspots devs have in that they believe

Code explains the what but not the why. And even then, the what might not be so clearly obvious. This is one of those blindspots devs have in that they believe their code to be good and obvious to everyone but in reality it is not even good and obvious to their future selves who will be the ones maintaining that code