"Optimizing" UI for session length and clicks is the same thing as finding the local maxima of bad, right?
It depends on your goal. If you want to show more ads for longer, it's the local maxima of profit. If you want to provide something like a quick reference guide, then yes, it's terrible. Instead of optimizing for some arbitrary metric you should focus on doing whatever you're doing right.
Behavioral analytics on user interaction can help you fix a bad design but shouldn't matter that much.