The phenomenon of incidental learning can be exploited as an approach to teaching that works better than the way schools traditionally have students learn facts about the world, namely, memorization. Memorization has problems. It's not fun and it doesn't lead to well-indexed knowledge. Incidental learning offers a way to have students learn facts that overcomes memorization's shortcomings. Not everything is fun to learn in and of itself.
Some information is dull to learn.
The incidental learning architecture offers a fun way for students to learn those boring things so that they will them come to mind when they will be useful.