No matter how big or good is your software, it has an unlimited number of bugs, especially if we remember that maintainability bugs also are very important for the overall quality of a product.

This is my talk at TestCon: https://www.youtube.com/watch?v=aYXuK2do6FA

The blog post you may want to read: https://www.yegor256.com/2017/05/23/unlimited-number-of-bugs.html

The video is here: https://youtu.be/ZdHCrsQsoMI