Many people think their code is clear. The problem is it is clear often only for the author and sometimes for a limited time even for the author. If anyone else start to working with the code questions usually arise. And you can prepare comments for at least some of such questions.
In my practice I often see code where useful comments are missing and hours of research required to learn something author for sure knew. Code which has too much comments to me is an imaginary problem - I've seen it at most a couple times in my career and one of them was the code written by a junior developer in a style one can expect in a tutorial or a book. But usually people quickly learn to not add unnecessary comments (and eventually start adding too little of them).
In my practice I often see code where useful comments are missing and hours of research required to learn something author for sure knew. Code which has too much comments to me is an imaginary problem - I've seen it at most a couple times in my career and one of them was the code written by a junior developer in a style one can expect in a tutorial or a book. But usually people quickly learn to not add unnecessary comments (and eventually start adding too little of them).