One of the hardest things about elearning is keeping the learner engaged. Some try to solve this problem by giving the learner lots of buttons to click. The problem with this is that clicking is a mindless activity. Often, it becomes a race to see how fast you can click though to get to the end. So you end up with a tired clicking finger but nothing else.
While clicking in navigation does have a place if combined with other functionalities, clicking itself is not engaging. So, use clicking only when it is needed and use other activities to keep the learner engaged.