Comment by laurentiurad

It's like any other muscle, if you don't exercise it, you will lose it.

It's important that when you solve problems by writing code, you go through all the use cases of your solution. In my experience, just reading the code given by someone else (either a human or machine) is not enough and you end up evaluating perhaps the main use cases and the style. Most of the times you will find gaps while writing the code yourself.