Connie shouldn't worry about it. There is a lesson in this. Most of this lecture isn't really all that difficult to grasp. For a teen that had figured out the nuances of his Geass through experimentation alone all of this seems rather basic.

"You can write all the notes you want, but they are useless when it comes to practical application," he explains when the lecture winds down. "You're not going to have time to look them over in the middle of a battle when lives are on the line."

In other words theories are good and plans are excellent, but theories might not pan out. Plans never go the way one might expect.