I seen that the canal message seemed to stop in my last run at around 400 turns. sometime early on i haven't seen it pop up later in game. I think you build one canal then ignore it i guess. some other messages may work this way. i like some the decisions we have to make. I'm not sure how many time i saw aldogoths or mellenial fair and other ones several times. not sure if this game has a way to win or I just see how far i can get.
I watched your video and discovered how William and Henry helped after aldogoths invade.