IMO too many coders can't write high quality code even if they tried. So when they write code that they feel is good enough, it rarely is good enough objectively.
What even is high quality code? I was on a project with a seasoned grey beard once and all he bitched about was dumb stuff like insisting NOT to prepend variable names with is and forcing a python project to have dependency injection. Sure, those things can make a high quality project but often misplaced and strangely opinionated.