It seems to be just as good at determining trend as something like DSS Bressert, but I don't understand why the histo bars will occasionally repaint once they have been placed. Is there a practical reason for this?

What is stranger is that I can see some history where the histo made an incorrect trend prediction, and yet those bars did not repaint. Red trendlines are failed trades, Gold are successful.

The most recent failed trade was entered live, when the bars were green.