A while ago there was a discussion here (https://news.ycombinator.com/item?id=20293041) about right-angle bends in PCB traces and why we avoid them. One of the suggested reasons was that they distribute current poorly and can cause failures under high current. This video (https://youtu.be/weJdXaGRJGY) from the article is a great illustration of this in action, giving a literal heat map of current density.