[ViVr]

This article seems to focus on clean code not having a significant effect on the software in production for the experience of the end user.

One example where I have experienced the benefits of a clean codebase is when onboarding new developers. It takes a few days of handholding but once they've started working with the code there's very little room for gotcha situations where they get stuck or inadvertently introduce bugs due to being misdirected by the code that was already there.