Divide and Conquer

Many of our newer developers--those who have worked only with git--seem to find bugs in their code only by using git's bisect command. This is troubling for a couple of reasons. The first is that often--once they find where the change occurred that caused the problem--they do not understand the cause, only that it happened between versions X and Y. The second is that they do not seem to understand the limits of debugging in this way, which, perhaps, is more a topic for you than for me to describe to you. Do you find this practice becoming more widespread and perhaps debilitating to good debugging?